Answer:
Expected return is 12.6%
Explanation:
Zero beta portfolio has no systematic risk. A zero beta portfolio has same expected rate of return as risk free rate. It does not effects with market change.
Using CAPM formula to calculate the expected return
Expected return = Risk free rate + Beta ( Market rate - risk free rate )
As we know
Expected return on zero beta portfolio = risk free rate
Expected return = 7% + 0.7 ( 15% - 7% )
Expected return = 7% + 0.7 ( 8% )
Expected return = 7% + 5.6%
Expected return = 12.6%