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Nowa paczzka = 15 wafelków = 2,10
2,10 : 12 = 0,175
2,10 : 15 = 0,14
0,175 = 100%
0,14 = x%
0,14 * 100 / 0,175 = 80%
100% - 80% = 20%
Odp: Wafelek jest tańszy o 20 %
2,1/12=0,175
Po promocji:
2,1/15=0,14
100%*0,14/0,175=80%
100%-80%=20%
2,10:15=0,14
14/17,5*100%=80%
100%-80%=20%