Develop a Crystal Ball model for Koehler Vision Associates (KVA) in Problem 15 of Chapter 9 with the following assumptions: The weekly demand averages 175, but anywhere between 10% and 20% of prospective patients fail to show up or cancel their exam at the last minute. Determine the best level of overbooking to maximize the net profit (revenue less overbooking costs). Assume that the demand is uniform between 110 and 160 per week.