Răspuns :
100%-25%=75%
75%...............................400 lei
100%............................. x lei
x=100x400:75=40.000:75=533,(3)
R: pretul initial a fost de 533,(3) lei
75%...............................400 lei
100%............................. x lei
x=100x400:75=40.000:75=533,(3)
R: pretul initial a fost de 533,(3) lei
x-pretul initial ;; x-25/100*x=400 => x-x/4=400 => 3x=1600 x=1600/3=533,(3). proba 533,(3)=(5333-533)/9=4800/9=1600/3 ,,,1600/3-25/100*1600/3=1600/3-400/3=1200/3=400