a.
[tex]\begin{gathered} 587000\times\frac{12}{100} \\ =70,440 \end{gathered}[/tex]$70,440 is the loan on 12 months by Credit union
[tex]\begin{gathered} 587000\times\frac{15}{100} \\ =88,050 \end{gathered}[/tex]$88,050 is the loan on 24 months, the loan on 12 months to compare is $44,025
B.the loan by Credit union will cost less but it must be paid in less time
C.we do the subtraction of each total loan
[tex]\begin{gathered} 88,050-70,440 \\ =17610 \end{gathered}[/tex]the first method would cost $17,610 less