In order to buy a car worth $25,000 a monthly payment of $622.12 is required.
Mortgages are one type of loan that frequently has a structure that calls for a stream of identical monthly payments. The lender can assess whether the customer's budget can support equal monthly payments by doing so.
Suppose the monthly payment is M.
With 9 percent APR, the effective monthly rate is 9%/12 = 0.75%.
There will be 12 x 4 years, or 48 monthly payments.
The face value of the loan must be equal to the present value of these monthly payments, or

which yields M = 622.12.
If you only paid interest, the monthly payment would be calculated as follows: principal * monthly interest rate (9% /12) = 25,000*0.75% = 187.5.
The results would be that after five years, you would still owe the whole amount of $25,000 and would have to pay $11,250 in interest.
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