The price of the new Copy Machine is
P = $5000
The interest is calculated by the formula:
I = P.r.t
Where r is the interest rate and t is the time, thus:
I = 5000 * 0.07 * 3
I = 1050
Thus the total payment, including interest is:
M = 5000 + 1050 = 6050
The monthly payment is calculated as the total payment divided by the number of months: 6050 / 36 = 168.06
Deborah must pay $168.06 each month for 3 years to pay the machine