Last Updated on November 4, 2026 by sanjjeett
What you will learn in this topic
Every business incurs costs while producing goods or providing services. Understanding how these costs behave and how directly they can be linked with a product helps managers plan, control and make better business decisions.
For ICSE Class 10 Commercial Studies, this topic focuses on the fundamental concept of cost and two separate bases of classification:
- Based on behaviour: fixed, variable and semi-variable costs.
- Based on nature: direct and indirect costs.
Costs — What to Study
For the complete subject structure, see the ICSE Class 10 Commercial Studies Syllabus 2027 and Exam Pattern.
Meaning of Cost
Cost is the amount of expenditure incurred or resources used to produce a good, provide a service or carry out a business activity.
For example, a furniture manufacturer may incur costs on wood, wages of carpenters, factory rent, electricity, office salaries and transport.
Each of these is a cost, but they do not all behave in the same way and they cannot all be traced to a particular product equally easily.
Fixed, Variable and Semi-variable Costs
When costs are classified according to behaviour, we study how the total cost changes when the level of production or business activity changes.
Fixed Cost
A fixed cost remains constant in total, within the relevant range, even when the level of output changes.
Examples: factory rent, permanent administrative salary, certain insurance or lease charges.
Rupee example: if monthly factory rent is ₹30,000, total rent remains ₹30,000 whether the factory produces 1,000, 2,000 or 3,000 units during that month.
Variable Cost
A variable cost changes with the level of production or activity.
Examples: raw material, packing material used per unit and piece-rate production wages.
Rupee example: if raw material costs ₹40 per unit, 100 units require ₹4,000, 200 units require ₹8,000 and 300 units require ₹12,000 of raw material.
Semi-variable Cost
A semi-variable cost contains both a fixed component and a variable component.
Example: an electricity bill with a fixed monthly charge plus additional charges based on units consumed.
If the fixed charge is ₹2,000 and the usage charge is ₹5 per unit, then at 1,000 units the total bill is ₹2,000 + ₹5,000 = ₹7,000.
| Basis | Fixed Cost | Variable Cost | Semi-variable Cost |
|---|---|---|---|
| Behaviour | Total remains constant within the relevant range. | Total changes with output or activity. | Contains both fixed and variable elements. |
| At Zero/Very Low Activity | Usually still exists. | May become zero if there is no activity. | Fixed portion normally remains. |
| Example | Factory rent. | Raw material. | Electricity bill with minimum charge plus usage charge. |
Direct and Indirect Costs
When costs are classified according to nature or traceability, we ask whether a cost can be identified directly with a particular product, job, process or unit of production.
Direct Cost
A direct cost can be directly identified with or traced to a particular product, job or production activity.
Examples: wood used to manufacture a table, cloth used to make a school uniform, sugarcane used in sugar production and wages of workers directly engaged in manufacturing a specific product.
Indirect Cost
An indirect cost cannot be conveniently or directly traced to one particular product, job or unit of production.
Examples: factory supervisor salary, office stationery, factory rent, depreciation on common machinery and administrative salaries.
| Basis | Direct Cost | Indirect Cost |
|---|---|---|
| Traceability | Can be directly traced to a specific product, job or unit. | Cannot be conveniently traced to one specific product, job or unit. |
| Relationship | Directly connected with the identified product or service. | Supports production or the business as a whole. |
| Examples | Raw material and direct production wages. | Supervisor salary, office stationery and common factory rent. |
One Cost Can Belong to Two Classifications
The behaviour classification and the nature classification answer different questions. Therefore, the same cost can be described in both ways.
| Cost Item | By Behaviour | By Nature | Reason |
|---|---|---|---|
| Wood used in furniture | Variable | Direct | More output requires more wood, and the wood can be traced to the product. |
| Factory rent | Fixed | Indirect | Total rent does not change with normal changes in output and cannot be traced to one unit. |
| Electricity bill with fixed charge plus usage charge | Semi-variable | May be indirect in a common factory setting | It contains fixed and usage-based parts and may support many products together. |
| Piece-rate wages for workers making a specific product | Variable | Direct | Total wages rise with output and can be traced to production. |
Identify the Correct Cost Type
| Situation | Correct Classification |
|---|---|
| ₹50,000 monthly factory rent regardless of normal changes in output | Fixed Cost |
| ₹30 worth of raw material required for each unit produced | Variable Cost |
| Electricity bill with ₹1,500 minimum charge plus usage charges | Semi-variable Cost |
| Leather used to manufacture a specific pair of shoes | Direct Cost |
| Salary of an office assistant serving the whole organisation | Indirect Cost |
| Salary of a factory supervisor responsible for several production lines | Indirect Cost |
Exam-style Questions with Model Answers
What is cost?
Answer: Cost is the amount of expenditure incurred or resources used to produce a good, provide a service or carry out a business activity.
What is a fixed cost? Give one example.
Answer: A fixed cost remains constant in total, within the relevant range, even when the level of output changes. Factory rent is an example.
What is a variable cost? Give one example.
Answer: A variable cost changes with the level of production or business activity. Raw material used per unit is an example.
What is a semi-variable cost?
Answer: A semi-variable cost contains both a fixed component and a variable component. For example, an electricity bill may contain a fixed monthly charge plus charges based on actual usage.
Distinguish between direct and indirect costs.
Answer: A direct cost can be directly identified with a specific product, job or unit of production, whereas an indirect cost cannot be conveniently traced to one specific product or unit and generally supports production or the business as a whole.
Why can raw material be both a variable cost and a direct cost?
Answer: Raw material can be variable because the total amount used normally increases when output increases. It can also be direct because the material can be directly traced to the product being manufactured. The two terms belong to different bases of classification.
Application-based Case
A school-bag manufacturer pays ₹40,000 per month as factory rent. Each bag requires fabric costing ₹180. The electricity bill includes a fixed monthly charge of ₹3,000 plus charges based on units consumed. The salary of the factory supervisor is ₹35,000 per month.
(a) Classify the factory rent according to behaviour.
(b) Classify the fabric cost according to behaviour and nature.
(c) Classify the electricity bill according to behaviour.
(d) Is the supervisor’s salary direct or indirect?
Model Answer:
- Factory rent — Fixed Cost.
- Fabric cost — Variable Cost by behaviour and Direct Cost by nature.
- Electricity bill — Semi-variable Cost.
- Factory supervisor’s salary — Indirect Cost, because it supports production generally and is not conveniently traceable to one particular bag.
Common Mistakes in Cost Questions
- Treating fixed, variable, semi-variable, direct and indirect as one single classification list.
- Assuming every variable cost is automatically direct.
- Assuming every fixed cost is automatically indirect without checking the nature of the cost.
- Writing that total fixed cost increases when output increases.
- Forgetting that semi-variable cost contains both a fixed and a variable component.
- Confusing direct cost with “important cost.” Direct means traceable to a specific product, job or unit.
- Introducing advanced classifications when the question only asks for the prescribed Class 10 categories.
Frequently Asked Questions
Is factory rent a fixed cost?
Yes. Factory rent is commonly treated as a fixed cost because the total rent usually remains unchanged despite normal changes in output during the period.
Is raw material a variable cost?
Yes. When more units are produced, more raw material is normally required, so total raw-material cost generally increases with output.
Can one cost be both variable and direct?
Yes. The classifications use different bases. Raw material can be variable because its total changes with output and direct because it can be traced to the product.
What is a common example of semi-variable cost?
An electricity bill with a fixed minimum charge plus additional charges according to usage is a common example of a semi-variable cost.
Also check
- Sources of Raising Capital Notes for ICSE Class 10 Commercial Studies Chapter 13
- Capital Market Notes for ICSE Class 10 Commercial Studies Chapter 12
- Budgeting Notes for ICSE Class 10 Commercial Studies Chapter 11
- Costs Notes for ICSE Class 10 Commercial Studies Chapter 10
- Final accounts of Sole Proprietorship Notes for ICSE Class 10 Commercial Studies Chapter 9
- Capital and Revenue Notes for ICSE Class 10 Commercial Studies Chapter 8
- E-commerce Notes for ICSE Class 10 Commercial Studies Chapter 7
- Consumer Protection Notes for ICSE Class 10 Commercial Studies Chapter 6
- Advertising and Sales promotion Notes for ICSE Class 10 Commercial Studies Chapter 5
- Pricing Notes for ICSE Class 10 Commercial Studies Chapter 4
- ICSE Class 10 Commercial Studies Notes
- Product and Service Notes for ICSE Class 10 Commercial Studies Chapter 3
- Marketing Notes for ICSE Class 10 Commercial Studies Chapter 2
- Stakeholders in Commercial Organisations Notes for ICSE Class 10 Commercial Studies Chapter 1
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Frequently Asked Questions (FAQs) on Commercial Studies Notes for ICSE Class 10
Q1: How should I use the notes to study for ICSE Class 10 Commercial Studies?
A1: To effectively use the notes:
Review Regularly: Regularly review your notes to reinforce your understanding of key concepts.
Highlight Key Points: Identify and highlight important terms, definitions, and concepts.
Practice Questions: Use your notes to answer practice questions and solve sample problems.
Summarize: Summarize lengthy sections into concise points for easier recall.
Q2: How can I effectively take notes for ICSE Class 10 Commercial Studies?
A2: To take effective notes:
Organize Information: Use headings, bullet points, and subheadings to structure your notes clearly.
Be Concise: Write key points and summaries instead of copying text verbatim.
Q3: Are there any recommended textbooks or resources for ICSE Class 10 Commercial Studies?
A3: Recommended resources include:
ICSE Textbooks: Refer to textbooks prescribed by the ICSE board for comprehensive coverage.
Reference Books: Books such as “Commercial Studies for Class 10” by various educational publishers.
Online Resources: Educational websites and online study platforms that offer summaries, sample papers, and additional notes.
