Stock Rit Rmt ai Beta
A 10.6 15     0 0.8
Z  9.8 8 0 1.1

Rit = return for stock i during period t
Rmt = return for the aggregate market during period t

What is the abnormal rate of return for Stock Z during period t using only the aggregate market return (ignore differential systematic risk)?

a. 3.40
b. 4.40
c. 1.80
d. -4.40

E.
-1.70