Hallo Anonymous,
1.) $${\mathtt{2\,900}}{\mathtt{\,\small\textbf+\,}}{\mathtt{40}}\% = {\mathtt{4\,060}}$$
2.) 100% + 40% = 140% = 140/100 = 1,4
$${\mathtt{2\,900}}{\mathtt{\,\times\,}}{\mathtt{1.4}} = {\mathtt{4\,060}}$$
3.) 40% von 2900 = $${\mathtt{2\,900}}{\mathtt{\,\times\,}}{\mathtt{40}}\% = {\mathtt{1\,160}}$$
2900 + 1160 = 4060
Gruß radix
!