5. Palin's Muffler Shop has one standard muffler that fits a large variety of cars. The shop wishes to establish a periodic review system to manage inventory of this standard muffler. Use the information in the following table to determine the optimal inventory target level (or order-upto level). a. What is the optimal target level (order-up-to level)? b. If the service probability requirement is 95 percent, the optimal target level [your answer in part (a)] will increase, decrease, or stay the same