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On decreasing the price of T.V. sets by 30 % its sale is increased by 20 %. What is the effect on the revenue received by the shopkeeper?

Correct answer: D. 16 % decrease

  • A. 10 % increase
  • B. 10 % decrease
  • C. 16 % increase
  • D. 16 % decrease

Explanation

Take the original price and sales as 100 units each, so original revenue is 100 x 100 = 10,000 revenue units. The new revenue is 70 x 120 = 8,400 revenue units, a decrease of 1,600 / 10,000 x 100 = 16%. The likely error is option b, 10% decrease, from subtracting the 20% sales increase from the 30% price decrease instead of multiplying the changes.

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