A fund of 3000$ is to be accumulated by n annual payments of 65$ at the end of each year, followed by n annual payments of 135$ at the end of each year, plus a smaller final payment made one year after the last regular payment. If the effective rate of interest is 6% per year, and n and the amount of the final irregular payment.

Note : We want the fund to payout at the same time as the irregular payment.