Answer:
5.74%
Step-by-step explanation:
WACC = weight of equity x cost of equity + weight of debt x cost of debt x (1 - tax rate)
weight of debt = D / (D + E) = 1.35/ (1.35 + 1) = 0.574468 = 57.4468%
weight of equity = 100% - 57.4468% = 42.5532%
let x represent pretax cost of debt
8.1% = 0.425532 x 14% +( 0.574468x) x 0.65
8.1% = 0.373404x + 5.957448%
solve for x
x = 5.74%