Weighted Avg. Cost of Capital?

I've got two solutions for the problem but dont know which is correct. Can anyone help…here is the problem followed by the two solutions.

The capital structure and the pretax cost of capital for each component are shown in the table below. Calculate weighted average cost of capital given that their marginal tax rate is 34 percent.

Component-Value-Cost of Capital

Bonds-$2,000-7.5%
Preferred stock-$1,000-15.0%
Common stock-$5,000-20.0%
Total-$8,000

Solutions

a. LT-Debt 25%
Pfd Stock 12.5%
Common Stock 62.5%

Therefore the WACC breakdown:

LT-Debt (After-tax cost): 7.5% * (1-.34) = 4.95% cost
Pfd Stock Cost: 15% (no tax adjustments required)
Common Stock Cost: 20% (no tax adjustments required)

So WACC: 4.95*0.25 + 15*0.125 + 20*0.625

= 1.2375+1.875+12.5

= 15.61% rounded

b.
bonds payable COC 7.5% * 2/8= 1.875%
preferred stock 15.0%* 1/8=1.875%
common stock 20.0%*5/8=12.5%
total WACOC 16.25%

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