Assume you earned $12\mathrm{.}3$ percent on your investments for a time period when the risk$-$free rate was $4\mathrm{.}25$ percent and the inflation rate was $1\mathrm{.}2$ percent. What was your real rate of return for the period?

$-9\mathrm{.}71\%$

$8\mathrm{.}21\%$

$10\mathrm{.}97\%$

$-10\mathrm{.}35\%$