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¹²/₁₀₀a=¹⁵/₁₀₀b /* ¹⁰⁰/₁₂
a=¹⁵/₁₀₀* ¹⁰⁰/₁₂ *b (100 skreślamy z jednego ułamka i drugiego )
a= 1,25b
a=125%
Odp.B