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-up-to level). a. What is the optimal target level (order-up-to level)? (Use Excei's NORMSINV0) function to find the correct critical value for the glven -level. Do not round intermediate calculations. Round " x " value to 2 decimal places and final answer to the nearest whole number.) (8) Answer is complete but not entirely correct