Answer:
c. ​15.0%
Step-by-step explanation:
First we need to calculate the Debt to equity ratio
Debt to equity ratio = Debt / Equity
Debt to equity ratio = 85% / 15% = 5.66667
Now calculate BTIRRE using following formula
BTIRRE = BTIRRP + ( BTIRRP - BTIRRD ) x Debt to equity ratio
Where
BTIRRP = 10.75%
BTIRRD = 10%
Placing values in the formula
BTIRRE = 10.75% + ( 10.75% - 10.00% ) x 5.66667
BTIRRE = 10.75% + 4.25%
BTIRRE = 15.00%