The abundance of three isotopes of oxygen are as follows:

$\mathrm{\%}\text{ of }{\mathrm{O}}^{16}=90\mathrm{\%}$

$\mathrm{\%}\text{ of }{\mathrm{O}}^{17}+\mathrm{\%}\text{ of }{\mathrm{O}}^{18}=10\mathrm{\%}$

Assume at. mass same as mass no. Find $\%$ of ${\mathrm{O}}_2$, if the isotopic mass is 16.12.