Aquaman, a retired widower, has $20,000 of interest and dividend income and also receives $10,000 in Social Security benefits. Aquaman is considering selling some stock. If he sells the stock he will have an $8,000 capital gain that he will report as income. (20 points) a. Assuming Aquaman does not sell the stock, what is Aquamans MAGI and what amount of his social security benefits are taxable? b. Assuming Aquaman does sell the stock, what is Aquamans MAGI and how much of his social security benefits will be taxable?