please show work in excel if possible.

Question 1 1 pts XYZ Corp. has a debt to equity ratio of 0.5, the firm's equity cost of capital is 10% and the firm has risk-free debt with an interest rate of 5%. In perfect capital markets what will be the cost of capital of the firm's operating assets if XYZ changes its debt to equity ratio to 0.75? Enter your answer as a percent without the "%. Round your final answer to two decimals