Charlie Stone wants to retire in 30 years, and he wants to have an annuity of $1,000a year for 20 years after retirement. Charlie wants to receive the first annuity payment at the end of the 31st year. Using an interest rate of 10%, how much must Charlie invest today in order to have his retirement annuity (round to the nearest \$10)? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an