A vendor's gives discounts to entice larger quantity purchases. The price breaks are as follows:
Order Size Discount Unit Price
0 - 40 0% $30
50 - 99 5% $28.50
100 or more 10% $27
If your store's yearly demand is 150 units, ordering cost is $20, and yearly inventory carrying cost is 25 percent of the unit prices, what order quantity policy should you follow?