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On selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:________?

Correct answer: D. Rs. 60Computer Online Quiz

  • A. Rs. 45
  • B. Rs. 50
  • C. Rs. 55
  • D. Rs. 60Computer Online Quiz

Explanation

If the cost price of one ball is Rs. x, the cost of 17 balls is Rs. 17x and the loss is Rs. 5x, so Rs. 720 = Rs. 17x - Rs. 5x = Rs. 12x. Therefore x = Rs. 720 / 12 = Rs. 60 per ball; the likely wrong choice is Rs. 45, caused by treating the loss as the selling price of 5 balls rather than their cost price.

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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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