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4 May, 11:52

You invest $1,000 in a complete portfolio. The complete portfolio is composed of a risky asset with an expected rate of return of 16% and a standard deviation of 20% and a Treasury bill with a rate of return of 6%, what proportion ofyour $1,000 investment should be invested into theriskyasset and what proportion into the Treasury bill if you want your portfolio to have an expected value of $1,100 in 1 year? What will be the resulting standard deviation of your complete portfolio?

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  1. 4 May, 12:55
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    The rate of return on the risky asset is 16% and on treasury bill is 6% and we need a return of (1100-1,000) / 1000 = 10% or 0.1

    If we think of x as the percentage investment in risky asset and 1-x as the investment in non risky asset we can mathematically find what proportion we need to invest in each asset to get this return.

    16x + 6 (1-x) = 10

    16x+6-6x=10

    10x=4

    x=4/10

    x = 0.4

    This equation tells us that we should invest 40% in risky assets and 1-x which is 60% in treasury bills. We can test our answer by putting these values and see if the return is 10 %

    (0.4*16) + (0.6*6) = Rate of return

    Rate of return=10%

    10% of 1000 = 100

    100+1000=$1100
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