Suppose that production for good X is characterized by the following production function, Q = K0.5L0.5, where K is the fixed input in the short run. If the per-unit rental rate of capital, r, is $86.80 and the per-unit wage, w, is $20, then the average total cost of using 25 units of capital and 49 units of labor is:

Multiple Choice

$5.

$75.

$90.

There is insufficient information to determine the average total costs.