Answer:
The return of stock C should be 25% for Karen to achieve her target.
Explanation:
The expected return on a portfolio is the weighted average of the individual stocks' returns that form up the portfolio. To calculate the expected return on the portfolio we use the following formula,
Portfolio return = wA * rA Â + Â wB * rB Â + Â ... Â + Â wN * rN
Where,
Let return of Stock C be x.
0.135 = 0.25 * 0.09 Â + Â 0.5 * 0.1 Â + Â 0.25 * x
0.135 = 0.0225 Â + Â 0.05 Â + Â 0.25x
0.135 - 0.0225 - 0.05 = 0.25x
0.0625 = 0.25x
x = 0.0625 / 0.25
x = 0.25 or 25%
The return of stock C should be 25% for Karen to achieve her target.