1)
Risk free rate, Rf = 6%
Return of ABC, Ra = 12%
Let Weight of ABC be W and Weight of risk free rate is (1-W)
Required return on portfolio, Rp = 15%
Rp= Ra * W + Rf *(1-W)
15% = 12% * W + 6% *(1-W)
15% = 12% W + 6% - 6% W
9% = 6%* W
W = 9/6 = 1.5
So, (1-W) = 1-1.5 = - 0.5
So Investment in stock ABC = 1.5 * 100,000= $ 150,000
So, (150,000 - 100,000) = $ 50,000 need to be borrowed.
2)
18% = 12% W + 6% - 6% W
12% = 6% W
W = 2
Investment in stock ABC = 2* 100,000 = $ 200,000
So, 100,000 need to be borrowed.
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