The standard deviation of the market-index portfolio is 20%. Stock A has a beta of 1.75 and a residual standard deviation of 30%. a. Calculate the total variance for an increase of 0.25 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 5.71% in its residual standard deviation. (Do not round intermediate calculations. Round your answer to the nearest whole number.) Total variance %-Squared