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