8.25-25Prozent

Am einfachsten geht es mit dem Rechner:

1.)    $${\mathtt{8.25}}{\mathtt{\,-\,}}{\mathtt{25}}\% = {\frac{{\mathtt{99}}}{{\mathtt{16}}}} = {\mathtt{6.187\: \!5}}$$

2.)       25 % von 8.25 = $${\frac{{\mathtt{8.25}}{\mathtt{\,\times\,}}{\mathtt{25}}}{{\mathtt{100}}}} = {\frac{{\mathtt{33}}}{{\mathtt{16}}}} = {\mathtt{2.062\: \!5}}$$   ;      $${\mathtt{8.25}}{\mathtt{\,-\,}}{\mathtt{2.062\: \!5}} = {\frac{{\mathtt{99}}}{{\mathtt{16}}}} = {\mathtt{6.187\: \!5}}$$

3.)        100 % -25 % = 75 % = 0,75         ;  $${\mathtt{8.25}}{\mathtt{\,\times\,}}{\mathtt{0.75}} = {\frac{{\mathtt{99}}}{{\mathtt{16}}}} = {\mathtt{6.187\: \!5}}$$

Gruß radix !