Answer:
9.33%
Step-by-step explanation:
The expected return of two asset portfolio is the weighted average of individual assets' expected to return as computed thus:
Portfolio expected return=(weight of market portfolio*expected return of market portfolio)+(weight of riskless security*expected return of riskless security)
weight of market portfolio=amount invested in market portfolio/total invested amount
weight of market portfolio=$80,000/$120,000=66.67%
expected return of market portfolio=market risk premium+riskless return
expected return of market portfolio=8%+4%=12%
weight of riskless security=1-66.67%=33.33%(since total investment which is 100% is 1)
expected return of riskless security=4%
Portfolio expected return=(66.67%*12%)+(33.33%*4%)
Portfolio expected return=\=9.33%