Your parents will retire in $10$ years. They currently have $$50,000,$ and they think they

will need $$170,000$ at retirement. What annual interest rate must they earn to reach

their goal, assuming they don't save any additional funds?

$24\mathrm{.}00\%$

$11\mathrm{.}52\%$

$29\mathrm{.}41\%$

$13\mathrm{.}02\%$