Steve’s shop sells sea shells by the sea shore. Steve buys shells from local collectors for an average price of $0.50 per shell. Steve sells on average 1000 shells each month. Each time he orders shells from collectors, there is a $20.00 shipping and handling fee. Steve estimates a unit holding cost of $0.50 per shell per year (many of them get broken if held in inventory too long). How often should Steve order sea shells?
A. About 3 times per month
B. About 1 time each month
C. About 1 time each year
D. About 1 time every other month