What is the abnormal rate of return for stock

Question

USE THE FOLLOWING INFORMATION FOR THE NEXT FOUR PROBLEMS

Stock    Rit    Rmt    ai    Beta
A        10.6    15      0    0.8
Z         9.8     8.0     0    1.1

Rit = return for stock i during period t

Rmt = return for the aggregate market during period t

Question 1. What is the abnormal rate of return for Stock A during period t using only the aggregate market return (ignore differential systematic risk)?

Question 2. What is the abnormal rate of return for Stock Z during period t using only the aggregate market return (ignore differential systematic risk)?

Question 3. What is the abnormal rate of return for Stock A when you consider its systematic risk measure (beta)?

Question 4. What is the abnormal rate of return for Stock Z when you consider its systematic risk measure (beta)?