Hastings Corporation is interested in acquiring Vandell Corporation. Vandell currently has a cost of equity of 10%; 25% of its financing is in the form of 6% debt, and the rest is in common equity. Its federal-plus-state tax rate is 38%. After the acquisition, Hastings expects Vandell to have the following FCFs and interest payments for the next three years (in millions):
Year1 Year 2 Year 3
FCF $10 $20 $25
Interest expense 28 24 20.28
After this, the free cash flows are expected to grow at a constant rate of 5%, and the capital structure will stabilize at 33% debt with an interest rate of 6.5%. What is the percentage cost of capital for the post-horizon period?