The standard deviation of the market-index portfolio is 45%. Stock A has a beta of 1.20 and a residual standard deviation of 55%. a. Calculate the total variance for an increase of 0.20 in its beta. (Do not round intermediate calculations. Round your answer to the nearest whole number.) Total variance %-Squared b. Calculate the total variance for an increase of 8.86% in its residual standard deviation. (Do not round intermediate calculations. Round your answer to the nearest whole number.) Total variance %-Squared