449,00 -1,9%=
$$\small{\text{
$
\begin{array}{rcl}
449,00 -1,9\% = \\\\
&=& 449,00 - \frac{1,9}{100}*449,00\\\\
&=& 449,00*(1-\frac{1,9}{100})\\\\
&=& 449,00*(\frac{100-1,9}{100})\\\\
&=& 449,00*(\frac{98,1}{100})\\\\
&=& 4,49*98,1\\\\
&=& 440.469
\end{array}
$
}}$$
!
