Answer: 4%
Step-by-step explanation:
Abnormal returns are the excess actual returns received over the expected return.
The actual return can be calculated as;
=
=
= 30%
The expected return according to CAPM;
Expected return = Risk free rate + beta( market return - risk free rate)
= 16% + 1 ( 26% - 16%)
= 26%
Abnormal return = 30% - 26%
= 4%