4. Firm's Costs Your cousin Vinnie owns a painting company with fixed costs of $250 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) 8 2 20 3 50 4 160 320 6 500 1.1.1.1. 720 The efficient scale is houses