(6 points) Ruben invested $1600 per year in an IRA each year for 6 years earning 10% compounded annually. At the end of 6 years he ceased the IRA payments, but continued to invest his accumulated amount at 10% compounded annually for the next 3 years. a) What was the value of his IRA at the end of 6 years? Answer = $ b) What was the value of the investment at the end of the next 3 years? Answer = $