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) 1 15 T V V 2 35 v v v 3 60 Y V v 4 90 v v v 5 135 v v v 6 240 V V v 7 480 v v v The efficient scale is :l houses