A Firm with a Production Function Q = KL (Where

Multiple Choice

A firm with a production function Q = KL (where K is units of capital and L is units of labor) has an expansion path that is given by K = 2L. The wage rate (W) is $20 and the rental on capital is $10. Assuming that the firm is using the optimal mix of inputs for any given output level, the total cost when using two units of labor is $____.

A) 160
B) 120
C) 80
D) 40