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2014-06-19T11:16:30+03:00
X- pret initial
x+20x/100=240
100x+20x=24000
120x=24000
x=24000:120
x=200 lei
1 5 1
2014-06-19T11:16:49+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=240

x=5*240/6
x=5*40
x=200lei