15. An 8% 10-year loan of 10,000 is to be paid by the sinking fund method, with service payment $900 and sinking fund payments made at the end of each year. The effective rate of interest earned in the sinking fund is 9% per annum. Immediately before the seventh payment is due, the lender requests that the loan is repaid immediately. Calculate the net amount of the loan at that time. A. $ 4,959.54 B. $ 5,121.78 C. $ 4,821.78 D. $ 5,034.57 E. $5,392.10