32% of 425 - ?% of 250 = 36
Correct answer: B. 40
- A. 20
- B. 40
- C. 60
- D. 80
Explanation
Calculate 32% of 425: 0.32 × 425 = 136. Hence 136 - (x/100 × 250) = 36, so x/100 × 250 = 100 and x = 40%. The likely mistake is 20%, which comes from using 50 instead of 100 as the required subtraction.
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About Percentages
Percentages express a quantity as parts per hundred and support calculations involving increases, decreases, discounts, commissions, taxes, and successive changes. Questions require distinguishing percentage change from percentage points and identifying the original value when a final value and its percentage change are given.
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