Răspuns :
x-pretul initial
10% din x= 10/100 * x= 1/10 * x= x/10-ieftinirea
x-x/10= (10x-x)/10=9x/10-noul pret
9x/10 =162
x=10*162/9
x=10*18
x=180
10% din x= 10/100 * x= 1/10 * x= x/10-ieftinirea
x-x/10= (10x-x)/10=9x/10-noul pret
9x/10 =162
x=10*162/9
x=10*18
x=180
x-10x/100=162
100x-10x=16200
90x=16200
x=16200:90
x=180 lei pret initial
100x-10x=16200
90x=16200
x=16200:90
x=180 lei pret initial