Help please

BooksRUs operates 50 weeks per year and uses a continuous review inventory system. It purchase a popular book for $12 per unit from a publisher. The following information is available about the book. Refer to the standard normal table at bottom of this page. . Average demand = 85 books/week . Standard deviation of weekly demand = 9 books . Order cost = $30/order . Annual holding cost = 25 percent of the unit cost . Desired cycle-service level=95.25 percent . Average lead time = 4 weeks . Standard deviation of lead time = 3 weeks . Current on-hand inventory is 300 books, with no open orders or backorders. What should be the reorder point (ROP)? (Enter your response rounded to the nearest whole number.)