What does calculating the weighed average cost of capitol tell you about Foust Company's financial strategy including the level of risk involved in the business? How could the company use WACC calculations in determining future investments?
You did not provide any specific data on the Foust Company's levels of debt or equity or any required/expected rates of return on debt and/or equity.
That said, I suggest you google WACC; Wikipedia has a pretty good explanation of the weighted cost of capital.