Happy Henry's car dealer sells an imported car called the EX123. Once every three months, a shipment of the cars is made to Happy Henry's. Excess demands are back-ordered from one three-month period to the next, buy have a good-will loss cost of $200. From experience, it appears that the demand for the EX123 is normally distributed with a mean of 50 and a variance of 36. The cost of holdng an EX123 for three months is $50. How many cars should Happy Henry's be purchasing every three months?
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