Answer: Zach will pay $2,500 in interest on this loan
Explanation: First, we must calculate Zach's monthly payment.
P=18900⋅ (0.05/12)
________________. = 356.67
1- ( 1 + 0.05/12) ^-60
If the monthly payments are $356.67, then the yearly payback is 356.67⋅12=$4280.04.
And, he will pay that each year for 5 years. So, 4280.04⋅5=$21,400.20 is the total payback amount.
Therefore, Zach will pay 21,400.20−18,900=$2500.20 in interest over the life of the loan.