Final answer:
The risk-free rate can be calculated using the capital asset pricing model (CAPM) formula.
Step-by-step explanation:
To find the risk-free rate, we need to use the formula for the capital asset pricing model (CAPM).
CAPM = Rf + beta × (Rm - Rf)
Here, Rf is the risk-free rate, beta is the stock's beta, Rm is the market return, and Rf is the risk-free return.
Given that the stock's beta is 0.8 and the required return is 10.6%, and the market risk premium is 7%, we can rewrite the formula as:
10.6% = Rf + 0.8 × 7%
Solving for Rf, we find that the risk-free rate is 3.8%.