a) 15%din 60=15%•60=15/100•60=900/100(simplificam)=9
b) 0,25din40=0,25/100•40=10/100(simplificam)=1/10=0,1
c) 50/13din390=50/13•390=19 500/13 = 1500
d) 35%din 7000=35/100•7000=245 000/100(simplificam)=
= 245
e) 2,5%din 100(este egal cu 2,5)
demonstrație:2,5/100•100=250/100(simplificam)=25/10=5/2=2,5