a.) Jake Werkheiser decides to invest $3000 in an IRA at the end of each year for the next 6 years. If he makes these investments, and if the certificates pay 9%, compounded annually, how much will he have at the end of the 6 years?

b.) Jake now deposits $400 at the end of every 6 months in an account that pays 6%, compounded semiannually. How much will he have at the end of 3 years?

c.) Jake now wants to have $30,000 at the beginning of each 6-month period for the next 4 1/2 years. If an annuity is set up for this purpose, how much must be invested now if the annuity earns 6.78%, compounded semiannually?