(50 - ?/29)% of 4200 = 3√196
Correct answer: D. 1421
- A. 1350
- B. 1450
- C. 1550
- D. 1421
Explanation
Since 3√196 = 3 x 14 = 42, the equation becomes (50 - ?/29)% of 4200 = 42. Dividing by 4200 and multiplying by 100 gives 50 - ?/29 = 1, so ?/29 = 49 and ? = 49 x 29 = 1421. The likely trap is 1350, which does not satisfy the percentage equation.
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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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