help me answer all these questions. It is 4 questions

1 . A life insurance company offers an annuity that pays 7 . 25% compounded monthly . IF $ 1000 is deposited into this annuity every month , how much is in the account after 15 years ? How much of this is interest ? Parents have set up a sinking fund in order to have $120000 in 15 years for their daughter 's college education ." How much should be put semiannually into the account if it pays 6 . 8 % compounded semiannually ?" 3 . Consolidated Oatmeal offers a 7 - year ordinary annuity with a guaranteed rate of 6 . 35% compounded annually . How much should you pay for one of these annuities if you want to receive payments of $19 , 000 annually over the 7 - year period ? 4 .. A sailboat costs $35 , 000 . You pay 20% down and amortize the rest with equal monthly payments over a 12 - year period . If you must pay 8.5% compounded monthly , what is your monthly payment ?* How much interest will you pay ?*