Răspuns :
x-pretul initial
10% din x= 10/100 *x= 1/10 *x= x/10 -reducerea
x-x/10= (10x-x)/10= 9x/10
9x/10=1080
x=10*1080/9
x=10*120
x=1200
10% din x= 10/100 *x= 1/10 *x= x/10 -reducerea
x-x/10= (10x-x)/10= 9x/10
9x/10=1080
x=10*1080/9
x=10*120
x=1200
100%-10%=90%
90%...............1080
100%........... x lei
x=100x1080 :90
x=1200-pretul initial
1200-1080=120 reducera
90%...............1080
100%........... x lei
x=100x1080 :90
x=1200-pretul initial
1200-1080=120 reducera