If the current inflation rate is $2\mathrm{.}36\%,$ and you have an investment opposiunity pat pays $9\mathrm{.}90\%,$ then the real rate of interest on your investment is closest to $$

A$.11\mathrm{.}50\%$

B$.10\mathrm{.}40\%$

c$.7\mathrm{.}40\%$

D$.8\mathrm{.}90\%$