The manager of a supermarket expects to sell 4800 cases of frozen orange juice during the coming year. The store's cost to store a case of the orange juice for a year is $8, and their cost to place an order for the orange juice is $75. The store can buy the orange juice for $50 per case. Determine the number of cases the store should purchase each time they place an order, and determine the number of orders they should place during the coming year.