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?
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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