Can someone help me with the below? Step by step instructions would be ideal.

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 decides to hire operators to monitor calls in order to attain the optimal number of personal calls (minimize total cost of personal calls).

Number of Operators          Total minutes of personal calls

             0                                            700

             1                                            570

             2                                            460

             3                                            370

             4                                            300

             5                                            250

1. What is the most the agency would be willing to pay the first operator?

2. If operators receive S38 an hour, how many operators should the agency hire?

3. Assume a change in the operator labor market results in operator wages rising to $47 an hour; what is the optimal number of operators the agency should hire after the wage change?

4. Assume that operators receive $38 an hour again, but that the cost of personal calls rises to $0.75 in wasted wages. How many operators should the agency hire now?