X Corporation just paid a dividend of $$4.$ What if $g=10\%$ for the first year, $20\%$ for the second year, and $15\%$ for the third year. before achieving long$-$run growth of $5\%?$ What is the fundamental value of the slock price of $x$ corporition if the cost of equity is $8\%?$ What should investor do if the stock price is $50$ Dollar? $($Show your calculation$)$