Sean purchases a retirement annuity that will pay him $1,500 at the end of every six months for the first eight years and $800 at the end of every month for the next five years. The annuity earns interest at a rate of 2.5% compounded quarterly. a. What was the purchase price of the annuity? Round to the nearest cent b. How much interest did Sean receive from the annuity? Round to the nearest cent