GRE Exam Numerical Ability Percentage

A group of store managers must assemble 280 displays for an upcoming sale. If they assemble 25 percent of the displays during the first hour and 40 percent of the remaining displays during the second hour, how many of the displays will not have been assembled by the end of the second hour? (A) 70 (B) 98 (C) 126 (D) 168 (E) 182

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Correct Answer is Option (C)

In the 1st hour, no.of displays assembled = 280 *25% = 70
Remaining to be assembled = 280-70 = 210
In the 2nd hour, no.of displays assembled = 210 * 40% = 84
Remaining to be assembled = 210 - 84 = 126.
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