Răspuns :
x-pretul initial
10% din x= 10/100*x= 1/10*x= x/10 -reducerea
x-x/10= (10x-x)/10= 9x/10 -restul
9x/10=27
x=10*27/9
x=10*3
x=30 lei costa produsul initial
10% din x= 10/100*x= 1/10*x= x/10 -reducerea
x-x/10= (10x-x)/10= 9x/10 -restul
9x/10=27
x=10*27/9
x=10*3
x=30 lei costa produsul initial
100%-10%=90%
90%...........27lei
100&..........x lei
___________--
x= 100x27/90
x= 2700:90
x=30 lei
90%...........27lei
100&..........x lei
___________--
x= 100x27/90
x= 2700:90
x=30 lei