Required information [The following information applies to the questions displayed below.] Christopher is a self-employed 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 Christopher has a 37 percent marginal tax rate. (Do not round intermediate calculations and round your final answer to the nearest whole dollar amount.) a. $3,000 fine for speeding while traveling to a client meeting. Answer is complete but not entirely correct. b. $3,300 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. c. $1,850 for office supplies in May of this year. He used half of the supplies this year and he will use the remaining half by February of next year. Answer is complete but not entirely correct. d. $1,700 for several pairs of work boots. Christopher expects to use the boots about 80 percent of the time in his business and the remainder of the time for hiking. Consider the boots to be a form of clothing