Răspunsuri

2014-05-17T18:15:40+03:00
X-pretul initial
10% din x= 10/100*x=1/10*x=  x/10-marirea

x+x/10= (10x+x)/10= 11x/10-noul pret

20% din 11x/10=  20/100*11x/10=  1/5 *11x/10=  11x/50-micsorarea

11x/10 -11x/50= (55x-11x)/50= 44x/50 

44x/50=2640
x=50*2640/44
x=50*60
x=3 000lei