10% i 15% z kwoty 30 zł
30·15% = 30 ·0,15 = 4,5
30·10%=30·0,1=3
30zł - 100%
x - 10%
100x= 10x30
100x=300/ 100
x= 3
30zł- 100%
x - 15%
100x= 15x30
100x= 450 /100
x=4,5
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30·15% = 30 ·0,15 = 4,5
30·10%=30·0,1=3
30zł - 100%
x - 10%
100x= 10x30
100x=300/ 100
x= 3
30zł- 100%
x - 15%
100x= 15x30
100x= 450 /100
x=4,5