A stock has an expected return of $10\mathrm{.}50$ percent. Based on the following information, what is the stock's return in a boom state of the economy?

$\backslash$table$[[$State of$,$Probability of$,$Rate of Return if$],[$Economy$,$State of Economy,State Occurs$],[$Recession$,\mathrm{.}33,-10\mathrm{.}18],[$Normal$,\mathrm{.}36,11\mathrm{.}68],[$Boom$,\mathrm{.}31,?$