Răspunsuri

2014-06-16T21:56:49+03:00
X-pretul initial

20% din x=  20/100* x= 1/5 * x=  x/5 -scumpirea

x + x/5= (5x+x)/5 =6x/5 -noul pret

6x/5=480
x=5*480/6
x=5*80
x=400
2014-06-16T21:57:48+03:00
X-pretul initial
100/100ori x + 20/100 ori x=480,120/100 ori x=480, simplificam, 6/5x=480, x= 480ori5:6=400