Phillips Co$.$ is growing quickly. Dividends are expected to grow at a rate of $25$ percent for the next three years, with the growth rate falling off to a constant $5$ percent thereafter. If the required rate of return is $12$ percent and the company just paid a dividend of $$3\mathrm{.}10,$ what is the current share price? $($Differential Growth$)$

I$\text{'}$m using the diffrential growth formula:

$P=\frac{C}{R-g_1}[1-\frac{(1+g_1{)}^T}{(1+R{)}^T}]+\frac{(\frac{Di{v}_{T+1}}{R-g_2})}{(1+R{)}^T}$

I keep getting the price $$67\mathrm{.}24.$ Am I using the correct formula to answer this question? Please show the step by step in solving this question. Thank you.