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Question 2

Które z poniższych równań poprawnie opisują nową cenę po podwyżce o \(r\) (gdzie \(r\) to ułamek dziesiętny)?

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\( \text{nowa cena} = \text{stara cena} \cdot (1 - r)\)

\( \text{nowa cena} = \text{stara cena} + \text{stara cena}\cdot r\)

\( \text{nowa cena} = \text{stara cena} + r\)

\( \text{nowa cena} = \text{stara cena} \cdot (1 + r)\)

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