To find the total interest paid, we need to subtract the principal amount from the total amount paid over the 40 months.
Total amount paid = Monthly payment * Number of months
Total amount paid = $796 * 40 = $31,840
Interest paid = Total amount paid - Principal amount
Interest paid = $31,840 - $23,734 = $8,106
Rounded to a whole number, Joni will pay $8,106 in interest.