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30% z 40 - 30% z jej zakupu
Wiemy, że:
1% = 0.01
10% = 0.1, więc:
30% = 0.3
30% z 40 = 0.3 * 40 = 12
12 pączków to 30% jej zakupu.
0,3x40=12 ;)
Liczę na naj ;)