The required return for Williamson Heating's stock is $12\%,$ and the stock sells for $$25$ per share. The firm just paid a dividend of $$1\mathrm{.}00,$ and the dividend is expected to grow by $30\%$ per year for the next $4$ years, so D$4=$ $$1\mathrm{.}00(1\mathrm{.}30)4=$ $$2\mathrm{.}8561.$ After t $=4,$ the dividend is expected to grow at a constant rate of X$\%$ per year forever. What is the stock's expected constant growth rate after t $=4,$ i$.$e$.,$ what is X$?$