Marissa purchases a retirement annuity that will pay her $1,000 at the end of every six months for the first eleven years and $900 at the end of every month for the next six years. The annuity earns interest at a rate of 4.2% compounded quarterly. a. What was the purchase price of the annuity? $0.00 Round to the nearest cent b. How much interest did Marissa receive from the annuity? $0.00 Round to the nearest cent.