Weekly demand for OnePlus 8 Pro smart phones at an online retailer in the U.S. is normally distributed with a mean of 4000 and a standard deviation of 1000. The wholesale price of the phone is $500 and the retail price is $700. OnePlus charges a fixed processing and delivery fee of $2000 for each order, and it takes two weeks to deliver an order. The online store is targeting a service level of 95% (z = 1.65). Assume 50 weeks per year and an annual interest rate of 20% to calculate the inventory holding cost