ERi = Rf + βi ( ERm − Rf )
where:ERi=expected return of investment
Rf=risk-free rate
βi=beta of the investment
(ERm−Rf)=market risk premium
15.25% = 3% + βi ( 10% - 3% )
12.25% = 7% βi
βi = 1.75
NOTE : The risk free rate given in the question is real so the risk free return for our beta calculation will be after adding inflation rate i.e. 0.6% + 2.4% = 3%.
If risk free rate given in the question is nominal then we ignore the inflation rate as it already included the effect of inflation premium.
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