Răspuns :
x-pretul initial
10% din x= 10/100*x= 1/10 *x= x/10 -reducerea
x-x/10= (10x-x)/10=9x/10 -noul pret
9x/10=1080
x=10*1080/9
x=10*120
x=1200
x/10-reducerea
1200/10=120 lei a fost reducerea
10% din x= 10/100*x= 1/10 *x= x/10 -reducerea
x-x/10= (10x-x)/10=9x/10 -noul pret
9x/10=1080
x=10*1080/9
x=10*120
x=1200
x/10-reducerea
1200/10=120 lei a fost reducerea
100?%-10%=90%
90%....................1080 lei
100%.................... x lei
x=1oo x 1080 /90
x=1200 lei
90%....................1080 lei
100%.................... x lei
x=1oo x 1080 /90
x=1200 lei