sabel, a calendar-year taxpayer, uses the cash method of accountIng for her sole proprletorship. In late December she recelved a :45,000 bill from her accountant for consulting services related to her small business. Isabel can pay the $45,000 bill anytime befor anuary 30 of next year without penalty. Assume her marginal tax rate is 37 percent this year and next year, and that she can earn ar fter-tax rate of return of 10 percent on her Investments. equired: What is the after-tax cost If Isabel pays the $45,000 bill in December? What Is the after-tax cost If Isabel pays the $45,000 bill In January? Use Exhibit 3.1 . Note: Round your answer to the nearest whole dollar amount. Based on requirements a and b, should Isabel pay the $45,000 bill In December or January? Complete this question by entering your answers in the tabs below. What is the after-tax cost if Isabel pays the $45,000 bill in December