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40-100 %
x-42%
40*42 kreska ulamkowa 100
skracamy zera i jest 4*42/10 = 169/10 =16,8
B)
18-100%
x-30%
18*30/100
18*3/10 = 54/10 = 5,4
LICZE NA NAJ :)))
40*0,42=16,8
b) 30% to 0,3
0,3*18=5,4