To calculate the interest amount paid on the part for the four-wheelers, we need to determine the total cost of the four-wheelers and then calculate the interest on that amount.
Given that Aunt Cindy bought 2 ATV four-wheelers at $2400 each, the total cost of the four-wheelers is:
2 * $2400 = $4800
Now, let's calculate the interest amount paid on the part for the four-wheelers.
To do this, we'll use the loan term of 15 years and the interest rate of 6.5%.
First, we calculate the interest rate as a decimal:
6.5% = 6.5/100 = 0.065
Next, we calculate the interest amount by multiplying the total cost of the four-wheelers by the interest rate:
$4800 * 0.065 = $312
Therefore, the interest amount paid on the part for the four-wheelers is $312.