Answer:
Portfolio return = 0.035 or 3.5%
Explanation:
The portfolio return is a function of the weighted average of individual stocks' returns that form up the portfolio. The formula to calculate the portfolio return is as follows,
Portfolio return = wA * rA + wB * rB + ... + wN * rN
Where,
First we need to calculate the investment of each stock,
Abbott = 200 * 50 = $10000
Lowes = 200 * 30 = $6000
Ball = 100 * 40 = $4000
Portfolio return = (10000 / 20000) * -0.10 + (6000/20000) * 0.20 +
(4000/20000) * 0.125
Portfolio return = 0.035 or 3.5%