Multiple choice

An article having marked price, Rs.900, was sold for Rs.648 after two successive discounts. The first discount was 20%. What was the percentage rate of the second discount?

  1. 5

  2. 15

  3. 10

  4. 12.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the second discount be d%. First discount 20% on Rs.900 gives 900 × 0.8 = Rs.720. Second discount d% on Rs.720 gives 720 × (1 - d/100) = Rs.648. So (1 - d/100) = 648/720 = 0.9, giving d/100 = 0.1 or d = 10%. Option C is correct. Option A (5%) would give 720 × 0.95 = Rs.684, B (15%) would give 720 × 0.85 = Rs.612, and D (12.5%) would give 720 × 0.875 = Rs.630.

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