Hannah wishes to accumulate $ 140000 in a fund at the end of 25 years. She plans to deposit $ 80 into the fund at the end of each of the first 240 months. She then plans to deposit ($ 80 +X) into the fund at the end of the last 60 months. Assume the fund earns interest at an annual effective rate of 1.81 %. Determine X.

The value of X = $ ?