John has taken out a $10,000 loan, which is being repaid with 30 level annual payments. The first payment will be one year from now. John pays an additional $500 during the fourth and twelfth payments. Following the two additional payments, the loan is repaid by annual payments of the original size with a larger final payment after the last full repayment.

If the effective annual interest rate is 5%, what is the amount of the larger payment?

A. 480

B. 640

C. 800

D. 970

E. 1130