The ionization energy of $He^+$ is $19.6\times 10^{-18}J/atom$.Calculate the energy of first stationary state of $Li^{2+}$

Question

$\begin{array}{1 1}(a)\;8.3\times 10^{-10}J/atom&(b)\;9.4\times 10^{-12}J/atom\\(c)\;44.1\times 10^{-18}J/atom&(d)\;44.1\times 10^{-12}J/atom\end{array}$