**Uneven periodic payments are made of 625 for first three years, 800 for fourth year, 825 for 5th or 6th year and 975 for remaining year. The payment are made for 9 years at 5.675% compounded annually. To what sum amount will grow if payments are made in beginning or end of year, which plan do he preferred. What is the difference in amount of both types?
Specify the interest gained in both?**
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