Suppose the riskless return is 412% and the factor sensitivities and factor return premiums for BioTherm and the S&P 500 index are given below. Using the APT, what should be the required returns for Biotherm shares and for the S&P 500 Stock index? Risk factor BioTherm factor sensitivity S&P 500 factor sensitivity Expected factor return premiums Confidence risk 0.15 0.30 2.70% Time horizon 0.70 risk 0.56 -0.70% Inflation risk -0.40 -0.35 4.30% Business- cycle risk 1.45 1.75 1.50% Market- timing risk 1.20 1.00 3.60%