5417,50 € -> 100 %
40,00 € -> p % p = 40 * 100 / 5417,5 = 0,738 %
$${\frac{{\mathtt{40}}{\mathtt{\,\times\,}}{\mathtt{100}}}{{\mathtt{5\,417.5}}}} = {\frac{{\mathtt{1\,600}}}{{\mathtt{2\,167}}}} = {\mathtt{0.738\: \!347\: \!946\: \!469\: \!773\: \!9}}$$
Der Stromanteil beträgt 0,738 % .
Gruß radix