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x % = 12,50 zł
x = = 156,25 %
156,25% - 100% = 56,25%
Odp. Farby są o 56,25% droższe od plasteliny.
cena plasteliny: 8 zł
100 %- 8
x- 12,50
x- 100 %*12,50/8=156,25 %
156,25 % - 100 %= 56,25 %
Liczę na naj ;)