Even if all of the work you have done so far is correct, you may not have completed everything. on of 30 value: 10.00 points ur answ The standard deviation of the market-index portfolio is 20%. Stock A has a beta of 2.80 and a residual standard calculati 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 4 decimal placs.) Total variance b. Calculate the total variance for an increa of 8.54% in its residual standard deviation. (Do not round intermediate calculations. Round your answer to 4 decimal places.) Total variance