Răspuns :
x-20x/100=100x-20x/100=80x/100=8x/10=4x/5
4x/5+30/100•4x/5=83200
4x/5+12x/50=83200
40x+12x/50=83200
52x/50=83200
52x=83200•50
52x=4160000
x=80000
4x/5+30/100•4x/5=83200
4x/5+12x/50=83200
40x+12x/50=83200
52x/50=83200
52x=83200•50
52x=4160000
x=80000
X-pretul initial
X...100%
Y...100-20=80%
Y-pretul al doilea
Y..................100%
83 200lei...100+30=130%
--> Y= (83 200×100):130=
=8 320 000: 130= 64 000 lei
X...100%
Y...80% inlocuim pe y
64000...80%
--> x= (64000×100):80= 6 400 000:80= 80 000
X...100%
Y...100-20=80%
Y-pretul al doilea
Y..................100%
83 200lei...100+30=130%
--> Y= (83 200×100):130=
=8 320 000: 130= 64 000 lei
X...100%
Y...80% inlocuim pe y
64000...80%
--> x= (64000×100):80= 6 400 000:80= 80 000