23. Pacific Tuna Corporation wants to know its optimal capital structure. Below is its debt as a percentage of total capital. What is the WACC for the company to be at its optimal capital structure?

D / D + E	beta	Cost of debt %	Cost of equity %	WACC %
0.1	0.96	6.5	8.1	7.7
0.2	1.04	6.5	8.4	7.6
0.3	1.15	6.5	8.8	7.4
0.4	1.28	7.5	9.4	7.6
0.5	1.48	8.5	10.2	7.8
0.6	1.76	10.5	11.3	8.6
0.7	2.24	12.5	13.2	9.6
0.8	3.20	14.5	17.1	10.8
0.9	6.08	16.5	28.6	12.4

Group of answer choices

a. 7.7%

b. 7.6%

c. 7.4%

d. 7.8%

e. None of the above