1.) $${\mathtt{1\,899}}{\mathtt{\,\small\textbf+\,}}{\mathtt{5}}\% = {\mathtt{1\,993.95}}$$
2.) 100%+5% = 105% = 105/100 = 1,05
$${\mathtt{1\,899}}{\mathtt{\,\times\,}}{\mathtt{1.05}} = {\mathtt{1\,993.95}}$$
3,) 5% von 1899 = $${\mathtt{1\,899}}{\mathtt{\,\times\,}}{\mathtt{5}}\% = {\frac{{\mathtt{1\,899}}}{{\mathtt{20}}}} = {\mathtt{94.95}}$$
$${\mathtt{1\,899}}{\mathtt{\,\small\textbf+\,}}{\mathtt{94.95}} = {\mathtt{1\,993.95}}$$
Gruß radix
!