was ergibt2100-5%=

$${\mathtt{2\,100}}{\mathtt{\,-\,}}{\mathtt{5}}\% = {\mathtt{1\,995}}$$

100% - 5% = 95%    

2100 * 95% = 2100 * 95/100 = 2100 * 0,95 = $${\mathtt{2\,100}}{\mathtt{\,\times\,}}{\mathtt{0.95}} = {\mathtt{1\,995}}$$

Gruß radix !