The Manager of the Quick Stop Corner Convenience Store (Which

The manager of the Quick Stop Corner convenience store (which is open 360 days per year) sells four cases of Stein soda each day (1440 cases per year) . Order costs are $8.00 per order. The lead time for an order is three days. Annual holding costs are equal to $57.60 per case.
-If the manager orders 16 cases each time she places an order, how many orders would she place in a year?

A) 22.5
B) 50
C) 72
D) 90