Ai relatia p% din b = a echivalenta cu p*b/100=a. Aici ai nevoie de ea astfel: p=100a/b
A) p=7*100/35=20%
B) p=100*100/500=20%
C) p=3*100/24=12,5%
D) p=6,3*6,3*100/15,75*15,75=16%
E) p=140*100/70=200%
F) p=99*100/33=300%
G) p=24*100/200=12%
H) p=28*100/350=8%