TeX source:
\begin{array}{rclcr}100\,\% &\widehat{=}& 450\,\text{EUR}\cr \cr 1\,\% &\widehat{=}& \dfrac{450\,\text{EUR}}{100} \cr \cr 35\,\% &\widehat{=}& \dfrac{35\cdot 450\,\text{EUR}}{100} &=& 157{,}50\,\text{EUR} \end{array}