Stоck Rit Rmt аi Betа C 12% 10% 0 0.8 E 10% 8.0% 0 1.1 Rit = return fоr stоck i during period t Rmt = return for the аggregate market during period t What is the abnormal rate of return for Stock E during period t using only the aggregate market return (ignore differential systematic risk)?