Ex. 6 ....................

clasa a VI-a: 25%600=1/4*600=600/4=150
clasa a VII-a: 25%600=1/4*600=600/4=150
clasa a V-a: 30%*600=3/10*600=1800/10=180
clasa a VIII-a: 600-150-150-180=450-150-180=300-180=120
Succes!