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12%-x
100%-30
100*x=12*30
100x=360
x=360:100
x=3,6
b) 35% kwoty 20 zł
35%-x
100%-20
100x=35*20
100x=700
x=700:100
x=7
c) 150% masy 32 kg
150%-x
100%-32
100x=150*3
100x=4800
x=4800:100
x=48
d) 2,5 % kwoty 1000zł
2,5%-x
100%-1000
100x-2,5*1000
100x=2500
x-2500:100
x=25
e) 12,5% kwoty 800$
12,5%-x
100%-800
100x=12,5*800
100x=10000
x=10000:100
x=100
f) 3,3% kwoty 150 Euro
3,3%-x
100%-150
100x=3,3*150
100x=495
x=495:100
x=4,95
g) 1,5% liczby 5
1,5 % - x
100%-5
100x=1,5*5
100x=7.5
x=7.5:100
x=0,075
h) 0,1% liczby 220
0,1%-x
100%-220
100x=0,1*220
100x=20
x=20:100
x=0,22
i)12% liczby 50000 zł
12%-x
100%-50000
100x=12*50000
100x=600000
x=600000:100
x=600
j) 125% masy 3000
125%-x
100% - 3000
100x=125*3000
100x=375000
x=375000:100
x=3750
k) 0,2% objętości 170l
0,2 % - x
100%- 170
100x=0,2*17-
100x=3,4
x=3,4:100
x=0,034
l) 2,1% masy 40
2,1% - x
100%-40
100x=2,1 * 40
100x=84
x=84:100
x-0,84