You earned $$19\mathrm{.}25$ in interest on a $$100$ investment over $4$ years. If interest is calculated annually, how much was your interest rate?

Question $14$ options:

$3\mathrm{.}5$

$3\mathrm{.}75$

$4\mathrm{.}0$

$4\mathrm{.}25$

$4\mathrm{.}5$

$4\mathrm{.}75$