Answer: 10%
Step-by-step explanation:
You invest equal amounts in a portfolio yielding 16% and a risk-free asset yielding 4%.
The expected return will be a weighted average of these two;
= (Weight of the Portfolio * Portfolio return) + (Weight of the Portfolio * risk-free rate)
= (0.5 * 16%) + (0.5 * 4%)
= 8% + 2%
= 10%