If you wish to earn a 22% return, you should borrow $375,000.
First step is to calculate the proportion of the investment
Using this formula
Rc = yRp+(1-y)Rf,
Where:
Rc=Return of return on the complete portfolio=.22
y=Proportion of the investment budget?
Rp=Return on risky portfolio=.16
Rf= Risk-free rate=.08
Let plug in the formula
0.22 = y(0.16)+(1-y)0.08,
y = 1.75
1-y = -0.75
Second step is to calculate the amount to borrow
0.75×$500,000
=$375,000
Based on the above calculation the negative sign indicate borrowing, therefore the amount to borrow is $375,000.
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