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$],[795,6,\%,1,541],[985,7,\%,1,878],[23,000,18,\%,149,832],[78,300,21,\%,328,815]]$