S. Patak and Smelley Co. manufactures foot devices for athletes and dancers. They usually have to wait 4 weeks for delivery of materials, and the usage rate is normally 25 devices a week. The ordering cost per order is $4.80 and the carrying cost per device per year is $.80. 

Required:

a Calculate the economic order quantity using the EOQ formula.

b Calculate the order point.

c When should S. Patak place the next order if the lead time happened to be 5 weeks and the inventory contains an amount equivalent to the economic order quantity? pg74