Preston Industries, Inc. currently manufactures part QX100, which is used in several products produced by the company. Monthly production costs for 10,000 units of QX100 are as follows: Direct materials $ 80 , 000 Direct labor $ 20, 000 Variable overhead costs $ 50, 000 Fixed overhead costs $ 40 , 000 Total manufacturing costs $190 , 000 Accounting has estimated that 20% of the fixed overhead costs currently assigned to QX100 would not be needed if the company chose to purchase the part from an outside supplier. Preston currently has the option of purchasing the part from an outside supplier at $16.00 per unit. Based solely on a short-run financial analysis, the maximum price that Preston should be willing to pay the outside vendor for each unit of QX100 is