The expected return of the portfolio = Weight of risky portfolio * return of risky portfolio + weight of t-bill * t-bill rate
0.08 = Wa * 0.12 + Wb * 0.02
We know that Wa + Wb = 1
Wb = 1 - Wa
0.08 = Wa * 0.12 + (1 - Wa) * 0.02
0.08 = Wa * 0.12 + 0.02 - 0.02 * Wa
0.08 = Wa * 0.10 + 0.02
Wa * 0.10 = 0.06
Wa = 0.06/0.1 = 0.6 = 6%
You should invest 60% in the risky portfolio to get 8% return on the combined portfolio.
That is 100,000 * 0.6 = $60,000
Let's verify if Wa = 0.6
The expected return of the portfolio = Weight of risky portfolio * return of risky portfolio + weight of t-bill * t-bill rate
The expected return of the portfolio = 0.6*0.12 + 0.4 * 0.02
The expected return of the portfolio = 0.08 = 8% (Verified)
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