Hallo Anonymous,
1.) $${\mathtt{1\,707}}{\mathtt{\,-\,}}{\mathtt{40}}\% = {\frac{{\mathtt{5\,121}}}{{\mathtt{5}}}} = {\mathtt{1\,024.2}}$$
2.) 1707 * ( 1-40/100) = 1707 * 0,6 = $${\mathtt{1\,707}}{\mathtt{\,\times\,}}{\mathtt{0.6}} = {\frac{{\mathtt{5\,121}}}{{\mathtt{5}}}} = {\mathtt{1\,024.2}}$$
3.) 40% von 1707 = $${\frac{{\mathtt{1\,707}}{\mathtt{\,\times\,}}{\mathtt{40}}}{{\mathtt{100}}}} = {\frac{{\mathtt{3\,414}}}{{\mathtt{5}}}} = {\mathtt{682.8}}$$
$${\mathtt{1\,707}}{\mathtt{\,-\,}}{\mathtt{682.8}} = {\frac{{\mathtt{5\,121}}}{{\mathtt{5}}}} = {\mathtt{1\,024.2}}$$
Gruß radix ! ( der sich über eine kurze Antwort freuen würde.)