Your parents will retire in 20 years and currently have $108,000 saved in a retirement account. They think they will be okay with $700,000 at retirement since your mom also has a pension and they should both get some money from Social Security. What annual interest rate must they earn to reach their goal, assuming they don't save any additional funds? 7.02% 8.36% 8.97% 9.80% 10.31%