Răspuns :
x-pretul initial
20% din x= 20/100 *x= 1/5 *x= x/5 -reducerea
x -x/5= x-24 aducem la acelasi numitor
5x-x=5x-120
4x-5x=-120
-x=-120
x=120
20% din x= 20/100 *x= 1/5 *x= x/5 -reducerea
x -x/5= x-24 aducem la acelasi numitor
5x-x=5x-120
4x-5x=-120
-x=-120
x=120
calculam pretul initial
x-20x/100=x-24
amplifici cu 100⇒100x-20x=100x-2400⇒2400=100x-80x⇒2400=20x⇒x=2400/20=120
calculam pretul obiectului dupa reducere cu 20%
120-(20/100)*120=120-20*120/100=120-2400/100=120-24=96lei
x-20x/100=x-24
amplifici cu 100⇒100x-20x=100x-2400⇒2400=100x-80x⇒2400=20x⇒x=2400/20=120
calculam pretul obiectului dupa reducere cu 20%
120-(20/100)*120=120-20*120/100=120-2400/100=120-24=96lei