4. Firm's Costs

Your cousin Vinnie owns a painting company with fixed costs of $200 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	10
2	20
3	40
4	80
5	160
6	320
7	640

The efficient scale is

houses.