Solve for the unknown interest rate in each of the following:

Note: Do not round intermediate calculations and enter your answers a 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]]$