show which formulas you used to solve these, thank you

\begin{tabular}{|c|c|} \hline Loan Choice: & Car Loan \\ \hline Price of Item: & $86,545.00 \\ \hline Down Payment (20\% of item): & $17,309.00 \\ \hline Principal (Amount Borrowed): & $69,236.00 \\ \hline \end{tabular} \begin{tabular}{|c|c|c|c|} \hline & \multicolumn{3}{|c|}{ Varying Terms (in months) } \\ \hline Varying APRs & 48 & 60 & 72 \\ \hline 8% & $1,690.25 & $1,403.86 & $1,213.93 \\ \hline 9% & $1,722.94 & $1,437.23 & $1,248.02 \\ \hline 10% & $1,756.00 & $1,471.06 & $1,282.65 \\ \hline \end{tabular} \begin{tabular}{|c|c|} \hline Group chosen APR: & 8% \\ \hline Group chosen Term (Yrs): & 5 \\ \hline Group chosen Term (Months): & 60 \\ \hline Group chosen Monthly Payment: & $1,403.86 \\ \hline Total Paid: & $84,231.39 \\ \hline Total interest Paid: & $14,995.39 \\ \hline \end{tabular} \begin{tabular}{|c|c|c|c|c|c|} \hline Payment Number (Month) & Previous Balance & Monthly Payment & Amount Paid to interest & Amount Paid to Balance Owed & New Balance \\ \hline 1 & $69,236,00 & $1,403.86 & & & \\ \hline 2 & & $1.403.86 & & & \\ \hline 3 & & $1.403.86 & & & \\ \hline 4 & & $1.403.86 & & & \\ \hline 5 & & $1,403.86 & & & \\ \hline & & $1,403.86 & & & \\ \hline 7 & & $1,403.86 & & & \\ \hline B & & $1,403.86 & & & \\ \hline 9 & & $1.403.86 & & & \\ \hline 10 & & $1.403.86 & & & \\ \hline 11 & & $1.403.86 & & & \\ \hline 12 & & $1.403.86 & & & \\ \hline 13 & & $1.403.86 & & & \\ \hline 14 & & $1.403.86 & & & \\ \hline 15 & & $1.403.86 & & & \\ \hline 16 & & $1.403,86 & & & \\ \hline 17 & & $1.403.86 & & & \\ \hline 18 & & $1.40386 & & & \\ \hline 19 & & $1.403.86 & & & \\ \hline 20 & & $1.403.86 & & & \\ \hline 21 & & $1.403.86 & & & \\ \hline 22 & & $1.403.86 & & & \\ \hline 23 & & $1.403.86 & & & \\ \hline \end{tabular}