Răspunsuri

2014-04-24T19:20:12+03:00
X- pret initial

x-10x/100=A - noul pret
A+10A/100=550
A+A/10=550 Amplif cu 10 pt a avea ac numitor

10A+A=5500
11A=5500
A=5500/11
A=500

x-10x/100=500
x-x/10=500 Amplif cu 10 pt a avea ac numitor
10x-x=5000
9x=5000
x=555.5

2014-04-24T19:22:39+03:00
A crescut cu 10 la suta, deci x+ 10x/100= 550 deci x= 500. 
A scăzut cu 10 la suta deci y-10y/100 = 500 deci y= 555,(5) 
raspuns final: 555,(5).