The standard deviation of the market-index portfolio is 30% Stock A has a beta of 2 .00 and a residual standard deviation of 50% a. Calculate the total variance for an increase of 0.20 in its beta. (Do not round intermediate calculations. Round your answer to 4 decimal places) Total variance b. Calculate the total variance for an increase of 7.06% in its residual standard deviation (Do not round intermediate calculations. Round your answer to 4 decimal places.) Total variance | 2