4. Firm's Costs Your cousin Vinnie owns a painting company with fixed costs of $150 and the following schedule for variable costs: Quantity Variable Cost Average Fixed Cost Average Variable Cost Average Total Cost ( Houses Painted per Month) (Dollars) (Dollars) (Dollars) (Dollars) 15 2 35 3 60 4 90 5 135 6 240 161. 1.1. 1.1.1.1 7 480 The efficient scale is houses