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If I purchased 11 books for Rs. 10 and sold all at the rate of 10 books for Rs. 11, the profit percent

Correct answer: C. 21%

  • A. 10%
  • B. 11%
  • C. 21%
  • D. 100%

Explanation

The cost of one book is Rs. 10 ÷ 11, while the selling price of one book is Rs. 11 ÷ 10. The ratio of S.P. to C.P. is (11/10) ÷ (10/11) = 121/100, so the profit is 21%. A student may choose 11% by comparing only the two stated bundle rates and overlooking that both rates involve different numbers of books.

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About Profit and Loss

Profit and loss compare the cost price and selling price of an item, using profit or loss percentages based on the cost price unless stated otherwise. Questions include marked price, discount, successive discounts, commission, and finding an unknown price, with care needed to distinguish discount from loss.

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