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,Years,Interest Rate,Future Value$],[230,3,\%,269],[350,17,\%,972],[38,000,18,\%,163,663],[37,261,20,\%,300,405]]$