Guten Abend Anonymous,
1.) $${\mathtt{512.26}}{\mathtt{\,-\,}}{\mathtt{2}}\% = {\mathtt{502.014\: \!8}}$$ ~ 502,01
2.) 100% - 2% = 98 % = 98/100 = 0,98
$${\mathtt{512.26}}{\mathtt{\,\times\,}}{\mathtt{0.98}} = {\mathtt{502.014\: \!8}}$$ ~ 502,01
Gruß radix !