At Dot Com, a large retailer of popular books, demand is constant at 20,400 books per year. The cost of placing an order to replenish stock is $8, and the annual cost of holding is $6.00 per book. Stock is received 6 working days after an order has been placed. No backordering is allowed. Assume 250 working days a year. a. Dot Com's optimal order quantity is 233 books. (Enter your response rounded to the nearest whole number.) b. The optimal number of orders per year is 88 orders. (Enter your response rounded to the nearest whole number.) c. The optimal interval (in working days) between orders is 3 days. (Enter your response rounded to one decimal place.) d. The demand during lead time is 490 books. (Enter your response rounded to the nearest whole number.) e. The reorder point is books. (Enter your response rounded to the nearest whole number.)