The Smith family has a loan of $150,000 from the bank to buy a new house in Chicago with an 8% Interest rate for 30 years. However, Mr. Smith had gotten a promotion due to his success in the work and therefore increased annual payment to $15,000 with the same interest rate for 21 years. Since the payment plan changed, due to the effect of rounding numbers, the last payment (21st) will be different than the normal annuity amount. Determine the amount of the last payment (21st) of the Smith family loan when 20 payments of $15,000 have already been paid