CSAT (Aptitude)·Definition

Cost Price and Selling Price — Definition

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Version 1Updated 6 Mar 2026

Definition

Cost Price (CP) and Selling Price (SP) are two of the most fundamental concepts in commercial arithmetic, forming the backbone of the Profit and Loss chapter, which is crucial for the UPSC CSAT examination. Understanding these terms clearly is the first step towards mastering related calculations.

Cost Price (CP): The Cost Price is the total amount of money spent by a seller or a manufacturer to acquire or produce a product. This includes the purchase price of the goods, along with any additional expenses incurred to bring the product to the point of sale.

For instance, if a shopkeeper buys an item from a wholesaler, the price paid to the wholesaler is the initial cost. However, if the shopkeeper also pays for transportation (freight), loading/unloading charges, or any repair costs before selling it, these 'overheads' are added to the initial purchase price to arrive at the total Cost Price.

In essence, CP represents the 'true' expenditure for the seller. It's the benchmark against which the profitability of a transaction is measured. If an item is manufactured, the CP would include raw material costs, labor costs, factory overheads, and any other direct expenses related to production.

Selling Price (SP): The Selling Price is the amount of money at which a product is sold to the customer. It is the revenue generated from the sale of an item. The SP is determined by various factors, including the CP, the desired profit margin, market demand, competition, and sometimes even government regulations or taxes.

The relationship between SP and CP dictates whether a transaction results in a profit or a loss. If the SP is greater than the CP, the seller makes a profit. If the SP is less than the CP, the seller incurs a loss.

If SP equals CP, it's a 'no profit, no loss' or break-even situation.

Profit: Profit occurs when the Selling Price (SP) of an item is greater than its Cost Price (CP). It represents the financial gain made by the seller from a transaction. Profit is calculated as: Profit = SP - CP.

Profit is often expressed as a percentage of the Cost Price (Profit Percentage) or, less commonly in CSAT, as a percentage of the Selling Price (Profit Margin). Understanding the difference between these two percentage bases is critical for avoiding common pitfalls in UPSC CSAT problems.

Loss: Loss occurs when the Selling Price (SP) of an item is less than its Cost Price (CP). It represents the financial deficit incurred by the seller from a transaction. Loss is calculated as: Loss = CP - SP. Similar to profit, loss is typically expressed as a percentage of the Cost Price (Loss Percentage). Minimizing losses and maximizing profits are core objectives in any commercial activity.

Marked Price (MP) / List Price: The Marked Price, also known as the List Price or Tag Price, is the price at which an article is listed for sale, usually printed on the tag or label. It is the price before any discount is offered.

Sellers often mark up their products from the Cost Price to arrive at the Marked Price, creating room for offering discounts while still potentially making a profit. The concept of Marked Price is crucial when dealing with discounts, as discounts are almost always calculated on the Marked Price, not the Cost Price.

Discount: A discount is a reduction offered on the Marked Price of an item. It is a concession given to the customer, usually to attract buyers, clear old stock, or during promotional sales. Discount is calculated as: Discount = Marked Price - Selling Price.

Discounts are typically expressed as a percentage of the Marked Price (Discount Percentage). After applying a discount, the customer pays the Selling Price. It's important to note that even after offering a discount, a seller might still make a profit if the Selling Price (after discount) is greater than the Cost Price.

These interconnected concepts form a vital analytical framework for solving a wide array of quantitative problems. From a UPSC CSAT perspective, a clear conceptual understanding of each term and their interrelationships is far more valuable than rote memorization of formulas, as problems often test the application of these principles in varied, multi-step scenarios.

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