The following loan is fully amortizing. The loan amount is $$10,000$ at $3\%$ interest to be repaid over four $(4)$ years. Amortize this loan on a monthly basis. You are to calculate the interest portion of the fourth $(4^{th})$ payment considering that an additional payment of $$2,000$ was made with the second payment.

See a dew diff options here on chegg. Want the right one. Please show work so i can learn.