Warning: Rounding in the calculation of month interest rates is discouraged. Such runding can lead to answers different from those presented here. For long-term cars, the differences may be pronounced You borrow $25,000 with a term of two years at AP of Use the station Rule for Short Term Loans to estimate your monthly payment Round your wer to the recent.) 5 Compare the estimate with what the monthly payment formula gives The actual monthly payment is equal to the estimated payment The actual mothy payment is about ss less an the estimated payment. The actual monthly payment is about $55 greater than the estimated payment