Project A has a beta of 1.7 and an expected rate of rate of return of 16.1%. Project B has a beta of 0.8 and an expected rate of return of 12.1%. What is the risk-free rate?
According to CAPM model,
ERi = Rf + β(ERm - Rf)
where,
ERi = Expected return of portfolio
Rf = Risk-free rate
β = Beta of the investment
ERm = Expected return of market
For Project A,
ERi = 16.1%
β = 1.7
=> 16.1 = Rf + 1.7(ERm -
Rf)
=> (ERm - Rf) = (16.1 - Rf)/1.7
...... (I)
For Project B,
ERi = 12.1%
β = 0.8
=> 12.1 = Rf + 0.8(ERm -
Rf)
=> (ERm - Rf) = (12.1 - Rf)/0.8
...... (II)
Substituting I and II
=> (16.1 - Rf)/1.7 = (12.1 - Rf)/0.8
=> 12.88 - 0.8Rf = 20.57 - 1.7Rf
=> Rf = (20.57 - 12.88) / (1.7 - 0.8) = 8.54%
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