$2\mathrm{.}5$ DuPont Return on Assets

DuPont return $on$ assets $=$ Profit margin $$ Asset turnover

Year $2=\frac{\text{N}\text{e}\text{t}\text{i}\text{n}\text{c}\text{o}\text{m}\text{e}}{\text{S}\text{a}\text{l}\text{e}\text{s}(\text{n}\text{e}\text{t})}\frac{\text{S}\text{a}\text{l}\text{e}\text{s}(net)}{\text{A}\text{v}\text{e}\text{r}\text{a}\text{g}\text{e}\text{t}\text{o}\text{t}\text{a}\text{l}\text{a}\text{s}\text{s}\text{e}\text{t}\text{s}}$

$=11\mathrm{.}11\%0\mathrm{.}65$ times $=7\mathrm{.}22\%.$please explain this ratio with formula in detail.