Răspuns :
1 tricou ....... 20 dolari
X.........13 dolari
20/x=1/13
X=13/20
X=0,65 x100=65 %
100%-65%=35 % s a ieftinit
X.........13 dolari
20/x=1/13
X=13/20
X=0,65 x100=65 %
100%-65%=35 % s a ieftinit