Răspuns :
x-pretul initial
30% din x= 30/100*x=3/10*x= 3x/10 -adaosul comercial
x+3x/10 =(10x+3x)/10= 13x/10 -noul pret
13x/10-600=x aducem la acelasi numitor
13x-6000=10x
13x-10x=6000
3x = 6000
x=2000 lei
30% din x= 30/100*x=3/10*x= 3x/10 -adaosul comercial
x+3x/10 =(10x+3x)/10= 13x/10 -noul pret
13x/10-600=x aducem la acelasi numitor
13x-6000=10x
13x-10x=6000
3x = 6000
x=2000 lei