$18.$ BlueCorp. is growing quickly. Dividends are expected to grow at a rate of $15$ percent for the next three years, with the growth rate falling off to a constant $4\mathrm{.}99$ percent thereafter. If the required return is $8\mathrm{.}31$ percent and the company just paid a $$2\mathrm{.}59$ dividend, what is the current share price $($in $$)?$

$19.$ A mature manufacturing firm just paid a dividend of $$19\mathrm{.}58$ but management expects to reduce the payout by $5\mathrm{.}99$ percent per year, indefinitely. If you require a return of $7\mathrm{.}63$ percent on this stock, what will you pay $($in $$)$ for a share today?