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Required information Problem 9-50 (LO 9-1, LO 9-2) [The following information applies to the questions displayed below.] Christopher is a cash-method, calendar-year taxpayer, and he made the following cash payments related to his business this year. Calculate the after-tax cost of each payment assuming he has a 37 percent marginal tax rate. (Do not round intermediate calculations and round your final answer to the nearest dollar amount.) Problem 9-50 Part-a a. $1,500 fine for speeding while traveling to a client meeting. After-tax cost b. $1,800 of interest on a short-term loan incurred in September and repaid in November. Half of the loan proceeds were used immediately to pay salaries and the other half was invested in municipal bonds until November. After-tax cost