A mining company routinely replaces a specific part on a certain type of equipment The usage rate is forty per week, and there is no significant seasonality. The supplier of the part offers the following all-units discount structure. Range of Q Unit Cost 0 < Q < 300 units $10.00 300 < Q $9.70 The fixed cost of a replenishment is estimated to be $25, and a carrying charge of 0.26 $/$/yr is used by the company. a. What replenishment size should be used? b. If the supplier was interested in having the mining company acquire at least 500 units at a time. what is the largest unit price they could charge for an order of 500 units?