a)25%din200=25supra100inmultit-cu200=50(se-simplifica0-urile-de-la-100cu-cele-de-la-200-si-ramane-25ori2..............................scuze-dar-nu-imi-functioneaza-prea-bine-tastatura)
12%din500=12supra100inmultit-cu500=(se-simplifica-zero-urile)12inmultit-cu5=60
50-60=-10
b)18%din1500=18supra100inmultit-cu1500=18inmultit-cu15(se-simplifica-0)=90
36%din250=36supra100inmultit-cu250=3,6inmultit-cu25(simplifici0-si-rezolvi-fractia-care-da3,6)=90
90-90=0