Solve for the unknown interest rate in each of the following: $($Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

$\backslash$table$[[$Present Value,$\backslash$table$[[$Years$],[6]],$Interest Rate,Future Value$],[$$$,755,\%,1,461],[,945,7,,1,798],[,19,000,18,,145,832],[,74,300,21,,320,815]]$