Investment in risky asset = 0.8 * 100,000 = 80,000
Investment in risk free asset = 0.2 * 100,000 = 20,000
Expected return on risk free asset = E(R) = 12%
Return on risk free asset = 3%
Expected return of the portfolio = E(R) = weighted average of portfolio assets returns = (w1*R1) + (w2*R2)(R1 risky asset, R2 risk free asset)
Therefore, E(R) for our portfolio = 80% *12% + 20%*3%
= 0.8*0.12 + 0.2*0.03
= 0.102 = 10.2%
The risk of our portfolio is equal to the standard deviation of two asset portfolio =
Portfolio variance = w2A*σ2(RA) + w2B*σ2(RB) + 2*(wA)*(wB)*Cov(RA, RB) ..[Variance = std. dev2]
But since, in our portfolio, the other asset is a risk free asset (std dev of risk free asset = 0), the equation for our portfolio, simply becomes,
Risk of the portfolio = Weight of risky asset * std. dev of risky asset
= 80% * 20%
= 0.8 * 0.2 = 0.16 = 16%
Realised return on portfolio = return on risky asset + return on risk free asset
Return on risky asset = 15% * 80,000 = 12,000
Return on risk free asset = 3% * 20,000 = 600
Hence, Return on portfolio = 12,000 + 600
= 12,600
Hence portfolio worth = Capital invested + realised return
= 100,000 + 12,600
= $112,600
= 10.2% * (+-(16%*10.2%))
Hence, maximum expected return = 0.102 + (0.16*0.102) = 11.832%
minimum expected return = 0.102 - (0.16*0.102) = 8.568%
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