Part c and e. will give thumbs down if question is not viewed in its entirety as parts have been completed already

Europe. The company currently has 110 phones available at Charles de Gaulle Airport in Paris. There are, on average, 26 customers per day requesting a phone. These requests arrive uniformly throughout the 24 hours the store is open. (Note.This means customers arrive at a faster rate than 1 customer per hour.) The corresponding coefficient of variation is 1 . Customers keep their phones on average 96 hours. The standard deviation of this time is 108 hours. Given that RentAPhone currently does not have a competitor in France providing equally good service, customers are willing to wait for the telephones. Yet, during the waiting period, customers are provided a free calling card. Based on prior experience, RentAPhone found that the company incurred a cost of $1.20 per hour per waiting customer, independent of day or night. (a) What is the average number of telephones the company has in its store? (Round your answer to nearest whole number.) Answer is complete and correct. (b) How long does a customer, on average, have to wait for the phone? (Round your answer to two decimal places.) Answer is complete and correct. (c) What are the total monthly ( 30 days) expenses for telephone cards? (Round your answer to two decimal places.) Answer is complete but not entirely correct. (d) Assume RentAPhone could buy additional phones at $1,000 per unit. Is it worth it to buy one additional phone? Answer is complete and correct. (e) How would waiting time change if the company decides to limit all rentals to exactly 96 hours? Assume that if such a restriction is imposed, the number of customers requesting a phone would be reduced to 15 customers per day. (Round your answer to five decimal places.) Answer is complete but not entirely correct