Inflation, nominal interest rates, and real rates. Given the following information, estimate the real rate with the approximate nominal interest rate equation and the true nominal interest rate equation $($Fisher effect$)$ for each set of nominal and inflation rates.

$\backslash$table$[[$Nominal Rate,Inflation Rate,$\backslash$table$[[$Approximate$],[$Real Rate$]],\backslash$table$[[$True$],[$Nominal Rate$]]],[13\mathrm{.}0\%,5\mathrm{.}0\%,,],[8\mathrm{.}0\%,2\mathrm{.}0\%,,],[21\mathrm{.}0\%,14\mathrm{.}0\%,,],[4\mathrm{.}0\%,7\mathrm{.}0\%,,]]$