Răspuns:
a) 40% din p=12
40/100 ×p=12/×100
40p=1200/:4
p=300
b) 40% din p=15
40/100 ×p=15/×100
40p=1500/:40
p=37,5
c) 40p/100=20/×100
40p=2000/:40
p=50
d) 40p/100=42/×100
40p=4200/:40
p=105
e) 40p/100=60/×100
40p=6000/:40
p=150
f) 40p/100=72/×100
40p=7200/:40
p=180
g) 40p/100=120/×100
40p=12000/:40
p=300
h)40p/100=224/×100
40p=22400/:40
p=560
i) 40p/100=54,6/×100
40p=5460/:40
p=135,6