429€ + 20% + 19% MwSt.

429€ + 20% + 19% MwSt.

$$\small{\text{$
\begin{array}{rcl}
429 \rm{~Euro~} + 20\% + 19\%\rm{~ MwSt.}\\\\
&=&429\cdot \left( 1+\dfrac{20}{100} \right) \cdot \left(1+ \dfrac{19}{100} \right)\\\\
&=&429\cdot 1,20 \cdot 1,19\\\\
&=& 612,612\rm{~Euro~}
\end{array}
$}}$$

=429 + 429*0,2 + 429*0,19 = 429*1,39 = 596,31