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2014-11-10T10:16:18+02:00
X-pretul initial
x+20%*x=30
x+x/5=30 aducem la acelasi numitor adica 5
5x+x=5*30
6x=150
x=25 lei

2014-11-10T10:17:06+02:00
X+20:100.x=30 ; se amplifica cu 100 si rezulta 100x+20x=3000; 120x=3000 x=3000:120; x=25