Productz Products Inc. offers the following discount schedule for its lunch bpxes. Order Unit Cost 9 boxes or less $18.00 100 to 149 boxes $17.50 150 or more boxes $17.25 Sweet Home Company orders lunch boxes and has an ordering cost of $7. Carrying cost is 10%, and annual demand is 1,000 boxes. What do you recommend? a. What is the optimal number of lunch boxes to order? [ Select ] b. What is the cost of the optimal number $ [ Select ]