Răspuns :
x-pretul initial
x+15/100(x)=460⇒
x+15x/100=460⇒
100x+15x/100=460⇒
115x/100=460⇒
115x=460x100⇒
115x=46000⇒x=46000:115⇒x=400
succes
x+15/100(x)=460⇒
x+15x/100=460⇒
100x+15x/100=460⇒
115x/100=460⇒
115x=460x100⇒
115x=46000⇒x=46000:115⇒x=400
succes
100+15=115%
x+15=115% x=100%
x=(460*100): 115=46000:115=400 lei
Proba: 400+15%=460
15% din 400=(400:100)*15=4*15=60
400+60=460