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a) 20% liczby50
10% * 50=0,1 * 50= 5
20%=10% * 2
20% * 50 = 2 * 5=10
b) 5% liczby 120
10% * 120=0,1 * 120= 12
5%=10% * ½
5% * 120 = ½ * 12=6
c) 30%liczby 60
10% * 60=0,1 * 60= 6
30%=10% * 3
30% * 60 = 3 * 6 = 18
d) 110% liczby 30
10% * 30=0,1 * 30= 3
110%=10% * 11
110% * 30 = 11*3=33
e) 150% liczby 70
10% * 70=0,1 * 70= 7
150%=10% * 15
150% * 70 = 15*7=105
Oblicz.
a) 5% liczby 50
5% * 50 = 5/100 * 50 = 5/2 = 2,5
b) 25% liczby 200
25% * 200 = 25/100 * 200= 25*2 = 50
c) 8o % liczby 700
80% * 700 = 80/100 * 700 = 80*7=560
d) 130% liczby 180
130% * 180 = 130/100 * 180 = 13/10 * 180 = 13*18=234
e) 180% liczby 40
180% * 40 = 180/100 * 40 = 18/10 * 40 =18*4=72