Solve for the unknown number of years in each of the following: $($Do not rou intermediate calculations and round your answers to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

$\backslash$table$[[$Present Value,Years,Interest,Rate,Future Value$],[570,10\mathrm{.}33,8,\%,1,293],[820,8\mathrm{.}27,12,\%,2,173],[18,500,24\mathrm{.}77,18,\%,343,880],[21,600,24\mathrm{.}01,14,\%,363,176]$