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$],[210,5,\%,270],[330,19,\%,997],[36,000,20,\%,175,751],[35,261,30,\%,764,676]]$