On 1 May, 2021, Diamonde, plc. presents its capital structure on its Balance Sheet Statement, as follow.

Account	Amount (AUD)
Bank loan	50.000
Bonds	150.000
Common stocks	1.000.000
Preferred stocks	300.000
Total	1.500.000

Additional information:

1. The bank loan has an interest rate of 10%

2. Currently, the bonds market price is AUD175,000, and the yield to maturity (YTM) is 8%

3. Last year dividend is AUD10 per share, and the estimated growth rate is 5%

4. Current market price of the common stocks is AUD30 per share.

5. The dividend of preferred stocks is AUD36,000 yearly 6. Marginal tax is 35%

Questions:

a. Calculate the cost of bank loan!

b. Calculate the cost of company bonds!

c. Calculate the cost of common stocks!

d. Calculate the cost of preferred stocks!

e. If the market value proportion of bank loan, bonds, common stocks, and preferred stocks is 3.33%, 10%, 66.67%, and 20%, respectively, what is the weighted average cost of capital (WACC) of Diamonde, Inc?

f. For what purpose companies use their WACCs for? Explain your answer using a finance principle!