30 The standard deviation of the marketindex portfolio is 15% Stock A has a bete of 200 and a residual standard deviation of 25% a. Calculate the total variance for an increase of 0.20 in its bet. (Do not round intermediate calculations. Round your answer to the nearest whole number) b. Calculate the total variance for an increase of 8,53in its residual standard deviation (De not reund intermediate calculations. Pound your answer to the nearest whole number Totale