Diagnostic Supplies has expected sales of 168,100 units per year, carrying costs of $4 per unit, and an ordering cost of $8 per order. a. What is the economic ordering quantity? b-1. What is the average inventory? b-2. What is the total carrying cost? Assume an additional 60 units of inventory will be required as safety stock. c-1. What will the new average inventory be? c-2. What will the new total carrying cost be