The standard deviation of the market-index portfolio is 10%. Stock A has a beta of 2.50 and a residual standard deviation of 20%. a. Calculate the total variance for an increase of 0.10 in its beta. (Do not round intermediate calculations. Round your answer to the nearest whole number.) Total variance b. Calculate he otal variance or an increase o 24% n s residual standard de ation. Do not round intermediate calculations. Round ouran erto the near es whole number. Total variance %-Squared %-Squared