Multiple choice

Two successive discounts, each of (x\%) on the marked price of an article, are equal to a single discount of Rs. 331.20. If the marked price of the article is Rs. 920, then the value of (x) is:

  1. 25

  2. 20

  3. 18

  4. 15
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For two successive discounts of x% each, final factor = (1 - x/100)². Single discount of Rs. 331.20 on Rs. 920 means discount% = 331.20/920 = 0.36 = 36%. So (1 - x/100)² = 1 - 0.36 = 0.64, giving 1 - x/100 = 0.8, so x/100 = 0.20 and x = 20%.

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