Răspuns :
x - 10x/100 = 8100
100x - 10x = 810000
90x = 810000 | : 10
9x = 81000
x = 81000 : 9
x = 9000 lei pret dupa prima reducerel
x - 10x/100 = 9000
100x - 10x = 900000
90x = 900000
x = 900000 : 90
x = 10000 lei pret initial
100x - 10x = 810000
90x = 810000 | : 10
9x = 81000
x = 81000 : 9
x = 9000 lei pret dupa prima reducerel
x - 10x/100 = 9000
100x - 10x = 900000
90x = 900000
x = 900000 : 90
x = 10000 lei pret initial
90% (100 - 10) ...............8100 lei
100% ............................. x lei
x = 8100 x 100 : 90 = 9000 lei
90% (100 -10) ...............9000 lei
100 ................................. x lei
x = 9000 x 100 : 90 = 10000 lei pretul initial
100% ............................. x lei
x = 8100 x 100 : 90 = 9000 lei
90% (100 -10) ...............9000 lei
100 ................................. x lei
x = 9000 x 100 : 90 = 10000 lei pretul initial