Please help. Thanks

Sarah's Muffler Shop has one standard muffler that fits a large variety of cars. Sarah wishes to es a sh a reorder p int system to manage ventory of his standard muffler. 55 per order Annual demand Standard deviation of daily demand Item cost Annual holding cost 4,200 mufflers Ordering cost 5 mufflers per working dayService probability 90% S 50 per muffler Lead time Working days 3 working days 300 per year 35 % of item value Use the above information to determine the best order size and the reorder point: (Use Excel's NORMSINVO) function to find the correct critical value for the given a-level. Do not round intermediate calculations. Round "z" value to 2 decimal places and final answer to the nearest whole number.) Best order size mufflers Reorder point l mufflers