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

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