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 consider the probability of balk