Calculate the required rate of return for Mars Inc.$\text{'}$s stock. The Mars's beta is $1\mathrm{.}9,$ the rate on a long$-$term T$-$bond is $5\mathrm{.}9$ percent, the expected return on the market is $11\mathrm{.}5$ percent, the market has averaged a $14$ percent annual return over the last six years, and Mars has averaged a $14\mathrm{.}4$ return over the last six years. $($Do not include the $\%$ sign and round to two decimal places, i$.$e$.,18\mathrm{.}35)$