An agency is having problems with personal phone calls made during working hours. Each minute of a personal call costs the agency $0.50 in wasted wages. The agency hires operators to monitor calls in order to attain the optimal number of personal calls (minimize total cost of personal calls).
Based on the above information, if operators receive $25 an hour, what is the minimum possible total cost of personal calls (per hour)?
A. $ 85
B. $120
C. $460
D. $255
E. none of the above
Answer: D
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