rate of 21%, but you can deduct the interest you pay on your loan from your stock income before calculating your tax bill. a. Calculate your net after-tax return on these positions. b. What would your after-tax return have been if you had never borrowed money and had invested just $40,000 in GoFast stock? a. Your net after-tax return on these positions is 6 . (Round to two decimal places.) b. If you had never borrowed money and had invested just $40,000 in GoFast stock, your after-tax return on these positions would have been (Round to two decimal places.)