Jeff Asked: A sum of $50,332 is to be repaid over a 9-year period through equal installments made at the end of

A sum of $50,332 is to be repaid over a 9-year period through equal installments made at the end of each year. If an interest rate of 8.9% per year is charged on the unpaid balance and interest calculations are made at the end of each year, determine the size of each installment so that the loan (principal + interest charges) is amortized at the end of 9 years.

Am i supposed to use the sinking fund payment with this? If so is S of the formula $50332 or is R $50332?

If S is 50332 then I got 3881.67 for my answer. is this correct?