TeX source:
\begin{array}{rclcr}5{,}6\,\text{l}&\widehat{=}& 100\,\% \cr \cr 1\,\text{l}&\widehat{=}& \dfrac{100\,\%}{5{,}6} \cr \cr 0{,}7\,\text{l}&\widehat{=}& \dfrac{0{,}7\cdot 100\,\%}{5{,}6} &=& 12{,}5\,\% \end{array}