A local repair shop is expanding and trying to determine if it should issue stock or debt. The firm's tax rate is expected to be 0.27. The treasury bond used to proxy the risk-free rate is at 0.025 rate. The S&P 500 Index has a return of .175 over the same period.

What is the shop's optimal amount of debt in their capital structure based on the following information?

Use the information from the table below:

	% debt	% Equity	Bond rating	Before tax cost of debt	leveraged beta
A	0.25	0.75	AA	.066	0.8
B	0.5	0.5	BBB	0.095	1.2
C	0.75	0.25	B	0.145	1.6

Post your answer to 0 decimal place as a percentage, 15 for example.