Răspuns :
x-costul initial
x-0,15x=0,85x=1020(costul dupa ieftinire)
Deci x=1200
Verificare:
0,15x=0,15*1200=180
x-180=1200-180=1020
cctd.
x-0,15x=0,85x=1020(costul dupa ieftinire)
Deci x=1200
Verificare:
0,15x=0,15*1200=180
x-180=1200-180=1020
cctd.
x-pretul initial
ieftinirea: x-15x/100=(100x-15x)/100=85x/100
85x/100=1020
x=(1020·100)/85
x=1200 lei pretul initial
verificare
1200x15/100=180
1200-180=1020
ieftinirea: x-15x/100=(100x-15x)/100=85x/100
85x/100=1020
x=(1020·100)/85
x=1200 lei pretul initial
verificare
1200x15/100=180
1200-180=1020