A jewelry store buys semiprecious stones to make bracelets. The supplier quotes the following:
Number of Stones Price per Stone (P)
1-399 $10
400-599 $9
600+ $8
The supplier charges $48 for each order. Assuming the store's annual demand of 5000 stones, and the annual holding/carrying cost 30% of unit cost, what is the optimum order size (decide based on total cost)?