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Problem 20-27 Sarah's Muffler Shop has one standard muffler that fits a large variety of cars. Sarah wishes to establish a reorder point system to manage inventory of this standard muffler. Annual demand Standard deviation of daily demand Item cost Annual holding cost 4,300 mufflers Ordering cost 7 mufflers per working day Service probability $ 55 per muffler Lead time 15 % of item value Working days 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" value to 2 decimal places and final answer to the nearest whole number.) Best order size Reorder point mufflers mufflers d muffler that fits a large variety of cars. Sarah wishes to establish a reorder this standard muffler. nd 4,300 mufflers Ordering cost 7 mufflers per working day Service probability $ 55 per muffler Lead time 15 % of item value Working days $ 45 per order 90 % 2 working days 300 per year e the best order size and the reorder point: (Use Excel's NORMSINVO) ue for the given a-level. Do not round intermediate calculations. Round "?" swer to the nearest whole number.)