The stock of Enigma Limited can best be modeled by a three-factor APT model. The tisk-free rate is 5%, the expected retum on the first factor is 7 . . the oxpected ceturn on the second factor is 13%, and the expected teturn on the third factor is 12% if by =0.5 bi =1.3 and biz =12. What is Enigma s-required relum in percent