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15/2.10
=2%
2,10/15=0,14
0,175-100%
0,14- x%
0,175x=14%
x=80
100%-80%=20%
2.1/15=0.14- cena za każdy wafelek po obniżce
0.175-0.14=0.035
0.035/0.175*100%=20%