WACC Williams, Inc., has compiled the following information on its financing costs:

Type of Financing	Book Value	Market Value	Cost
Short-term debt	$12,000,000	$12,500,000	4.1%
Long-term debt	20,000,000	23,000,000	7.2
Common stock	9,000,000	54,000,000	13.8
Total	$41,000,000	$89,500,000

The company is in the 21 percent tax bracket and has a target debt-equity ratio of 60 percent. The target short-term debt/long-term debt ratio is 20 percent.

a. What is the company's weighted average cost of capital using book value weights? b. What is the company's weighted average cost of capital using market value weights? c. What is the company's weighted average cost of capital using target capital structure weights?

d. What is the difference between WACCs? Which is the correct WACC to use for project evaluation?

Show all the steps and don't round off calculations.