please answer both accurely 1 and 7: 1.The standard deviation of the market-index portfolio is 20%. Stock A has a beta of 2.80 and a residual standard deviation of 30%. Required: a. Calculate the total variance for an increase of 0.25 in its beta. (Do not round intermediate calculations.) b. Calculate the total variance for an increase of 3 percentage points in its residual standard deviation. (Do not round intermediate calculations.)   7. A project has a 0.48 chance of doubling your investment in a year and a 0.52 chance of halving your investment in a year. What is the standard deviation of the rate of return on this investment? (Do not round intermediate calculations. Round your answer to 2 decimal places.)

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