Answer:
65% of the portfolio is invested in stock.
Explanation:
The weight of stock is assumed to be x.
Then, the Weight of Risk-Free Stock will be 1 - x.
[tex]Beta\ of\ Portfolio\ =\ Weight\ of\ Stock\ \times\ Beta\ of\ Stock\ +\ Weight\ of\ Risk\ free\ asset\ \times\ Beta\ of\ Risk\ Free\ Asset[/tex]
Beta of Portfolio =[tex]x\ \times\ 1.17\ +\ [\ ( 1\ -\ x)\ \times\ 0][/tex]
0.76 = 1.17 x
x = 0.76 / 1.17
x =0.64957
x = 64.957%
So, 65% of the portfolio is invested in stock.