If you could please explain how you got the results it would help me better understand. Thank you.

E Office Supplies sells discounted office suppliers over the Internet. One popular product sold is legal-size notepads. E Office Supplies offers the following quantity discount structure, based on how many dozen notepads are ordered:

Order Size	1-19 dozen	20-99 dozen	100-199 dozen	200+
Price	$21.95 per dozen	$19.95 per dozen	$18.95 per dozen	$17.95 per dozen

The STHDS law firm wants to decide how many legal notepads to order using the EOQ model for quantity discounts. Its ordering cost is $35 per order, its anticipated need (demand) in the coming year is for 1,500 dozen notepads, and its annual holding cost is 40 percent of the acquisition cost. Assume that shipments are received instantaneously, demand is known and the usage constant, and the lead time is known and constant.

a) Based on the lowest total annual cost (ordering plus holding plus acquisition cost), how many dozen notepads should STHDS order each time?

b) What is the resulting total annual cost (ordering plus holding plus acquisition cost) per year for this order quantity?