Please show your work for study purposes.I dont know what formulas to use...

1. Find the amount to which semi-annual deposits of $200 will grow in four years at 6.6% p.a. compounded semi-annually.

2. Leanne Simon made ordinary annuity payments of $81.00 per month for fourteen years earning 9% compounded monthly. How much interest is included in the future value of the annuity?

3. Find the present value of ordinary semi-annual payments of $810 for five years at 5.45% p.a., compounded semi-annually.

4. If a loan was repaid by ordinary monthly payments of $715 in seven years at 9.12%, compounded monthly, how much interest was paid?