Question $7$ to Question $10$ is based on this problem.

Refer to the previous problem. Suppose that Boot Barn$$s phone system can only keep four calls on hold at any time, the average profit margin of each call is $$55$ and sales reps cost the company $$12$ per hour.

If callers who receive a busy signal take their business elsewhere, how much money is the company losing per hour $($on average$)$ if it employed a single sales rep $($i$.$e$.$ without hiring the additional employee mentioned in previous problem$)?$ Rounding decimals of your calculation to units. Hint: you need to use the arrival rate of customer calls and the probability of balk $($which will be given in the Excel output if you choose the right queue model$)$ in the calculation $.$