Harriet wishes to accumulate $60,000 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 120...

Harriet wishes to accumulate $60,000 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 120 months. She then plans to deposit $80 + X into the fund at the end of each of the last 180 months. Assume the fund earns interest at an annual effective rate of 3.66%

Determine X.

Can someone please show me how to solve this problem? Thank You!!