Problem 3 A local repair shop buys hex nuts and molly screws from the same supplier. The hex nuts cost $0.75 each and the molly screws cost $1.60 each. An ordering cost of $60 is assumed for orders of hex nuts and $70 for orders of molly screws. Holding costs are based on a 30% annual rate. The shop uses an average of 25,000 hex nuts and 21,000 molly screws annually. (Show your calculations for all questions): a. What is the optimal order size for each of the 2 items? Hint: round your numbers if you do not get an integer quantity (Q). b. What is the time between orders for each of the 2 items?