A construction project was estimated to be completed in 180 days. Due to rain, only 60% of the days were productive. If the work done each productive day is constant, by what percent must daily output be increased to complete the project on time?
Answer
The correct answer is B: 66.67%. Productive days = 0.6 × 180 = 108 days. To complete 180 days' work in 108 days, daily output must be 180/108 = 5/3 times.
A.70.43%
B.66.67%✓ Correct
C.60.65%
D.65%
Explanation
Productive days = 0.6 × 180 = 108 days. To complete 180 days' work in 108 days, daily output must be 180/108 = 5/3 times. Increase = (5/3 − 1) × 100 = 66.67%.
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