The solution is: 9 and $32.41.

Problem 19.7 A fund of 2.000 is to be accumulated by n annual payments of 50 by the end of each year, followed by n annual payments of 100 by the end of each year, plus a smaller final payment made 1 year after the last regular payment. If the effective rate of interest is 4.5%, find n and the amount of the final irregular payment