Answer:
A. $17,640
B.$18,666
Step-by-step explanation:
a. Calculation for the after-tax cost if Isabel pays the $28,000 bill in December
First step is to find the Tax savings in current year
Tax savings in current year = $28,000*37%
Tax savings in current year = $10,360
Last step is to calculate for the After tax cost using this formula
After tax cost = Cost of bill - Tax savings
Let plug in the formula
After tax cost= $28,000-$10,360
After tax cost=$17,640
Therefore the after-tax cost if Isabel pays the $28,000 bill in December will be $17,640
b. Calculation for the after-tax cost if Isabel pays the $20,000 bill in January
First step is to find the Tax savings in next year
Tax savings in current year = $28,000*37%
Tax savings in current year = $10,360
Second step is to find the present value of $1 ($28,000/$28,000) at 11% for one year using present value table
Present value of $1 at 11% for one year = 0.901
Present value of tax savings = $10,360* .901
Present value of tax savings =$9,334.36
Last step is to calculate for the After tax cost using this formula
After tax cost = Cost of bill - Tax savings
Let plug in the formula
After tax cost = $28,000-$9,334.36
After tax cost=$18,665.64 approximately $18,666
Therefore the after-tax cost if Isabel pays the $28,000 bill in January will be $18,666