A developer codes an app in 30 days. A new tool speeds him up by 20% but he takes weekends off. How long to finish if he works Mon-Fri only?
Correct answer: C. 37.5
- A. 34
- B. 36
- C. 37.5
- D. 38
Explanation
The developer originally completes the app in 30 calendar days. With a 20% speed increase, his effective working rate improves to 1.2 times his original speed, reducing the time to 30 / 1.2 = 25 continuous days if he worked every day. However, since he only works Monday to Friday, the calculation must convert continuous days to workdays. He works 5 out of 7 days each week, meaning the effective number of workdays is 25 / (5/7) = 35 workweek days, which translates to 37.5 actual weekdays. This accounts for the speed increase and the weekends off. Other options incorrectly calculate the balance between speed and workdays.
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