a)24 elevi ________100%
8 elevi _________ x
x=800/24=33,(3)% dintre elevi au obtinut nota 10.
b)800 lei ________100%
x ________ 40%
x=32000/100=320 lei reducerea
=>noul pret va fi 800-320=480 lei
c)600 lei __________100%
x __________ 10%
x=6000/100=60 lei scumpirea
=>noul pret va fi 600+60=660 lei