- The beta of Samsung Electronics is 0.88, and that of Apple is 1.30

- Use the interest rate on a three-month U.S. Treasury bill or 3-year KTB yield as the risk-free rate. Use Yahoo Finance or Naver Finance giving the rate. Use the average annualized overall stock market return (S&P 500 index or KOSPI 200) over the past 10 years as a market rate of return.

Calculate a return on equity (required rate of return by CAPM) of Samsung Electronics and Apple using a market data, market rate of return, and a risk free rate.