Answer:
A. $11,970
B. $11,890
C. January
Explanation:
a. Calculation for the after-tax cost if Isabel pays the $19,000 bill in December
After-tax cost=$19,000 - ($19,000 x 37%)
After-tax cost= $19,000 - $7,030
After-tax cost= $11,970
Therefore the after-tax cost if Isabel pays the $19,000 bill in December will be $11,970
b. Calculation for the after-tax cost if Isabel pays the $19,000 bill in January
First step is to calculate the cost before taxes
Cost before taxes = $19,000 - ($19,000 x 8%/12) Cost before taxes= $19,000 - $127
Cost before taxes= $18,873
Now let calculate the After-tax cost
After-tax cost = $18,873 - ($18,873 x 37%)
After-tax cost= $18,873 - $6,983
After-tax cost = $11,890
Therefore the after-tax cost if Isabel pays the $19,000 bill in January will be $11,890
c. Based on the above calculation for both a and b, Isabel should pay the amount of $19,000 bill in January reason that it has the lowest cost of debt of the amount of $11,890 compare to December which has the cost of debt of the amount of $11,970.
