What will be 80 Percent of a number whose 200 percent is 90?
Correct answer: C. 36
- A. 144
- B. 72
- C. 36
- D. none of these
Explanation
If 200% of the number is 90, then the number is 90 / 2 = 45. Therefore, 80% of it is 0.8 x 45 = 36. The likely mistake is option b, 72, which treats 80% as 80% of 90 instead of 80% of the original number.
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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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