Barry S. answered 11/10/15
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If Matt buys the truck, paying 10% down, he will be paying $2,500. So he'll need to finance $22,500.
With simple annual interest of 2.9% over 4 years, the interest amount he'll need to pay is:
Interest = principle * rate * time
I = 22500 * .029 * 4 = 2610
Adding the interest to the amount financed (principle), he'll need to pay $25,110 over the next four years.
There are 48 months in 4 years, so his monthly payment will be 25110 ÷ 48 = $523.125 or $523.13.