Answer:
The firm's cost of common stock is 13%
Explanation:
Use the following CAPM formula to calculate the cost of common stock
Cost of common stock = Risk free rate + beta x ( Market return - Risk free rate )
Where
Risk free rate = 5.5%
Market return = 11.50%
Beta = 1.25
Placing values in the formula
Cost of common stock = 5.5% + 1.25 x ( 11.50% - 5.5% )
Cost of common stock = 13%