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$],[$$ $735,6,\%,$$ $1,421],[925,7,\%,1,758],[17,000,18,\%,143,832],[72,300,21,\%,316,815]]$