Walsh Corporation's relevant range of activity is 7,000 units to 11,000 units. When it produces and sells 9,000 units, its average costs per unit are as follows Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Fixed selling expense Fired administrative expense Sales commissions Variable administrative expense Average Cost per Unit 5.50 3.90 1.30 13.50 2.25 1.80 0.50 0.45 10,000 units are produced the total amount of manufacturing overhead cost is closest to Select one a $146.000 b. $134 500 C$157.500 d. $180,500