Answer :
[tex]T=L+F(1+N)[/tex]
Where:
T = Total cost
L = Loan amount
F = Finance Charge
N = Number of Rollovers
so:
[tex]\begin{gathered} L=900 \\ F=42 \\ N=\frac{12}{2}=6 \\ so\colon \\ T=900+42(1+6) \\ T=900+42(7) \\ T=900+294 \\ T=1194 \end{gathered}[/tex]$1194