Respuesta :
so, the price was 2.85, it went up to 2.92, or $0.07 or 7 cents.
now, if we take 2.85 to be the 100%, what is 0.07 off of it in percentage?
[tex]\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 2.85&100\\ 0.07&p \end{array}\implies \cfrac{2.85}{0.07}=\cfrac{100}{p}\implies p=\cfrac{0.07\cdot 100}{2.85}[/tex]
now, if we take 2.85 to be the 100%, what is 0.07 off of it in percentage?
[tex]\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 2.85&100\\ 0.07&p \end{array}\implies \cfrac{2.85}{0.07}=\cfrac{100}{p}\implies p=\cfrac{0.07\cdot 100}{2.85}[/tex]
The price rose by 2.5 %
What is percentage?
A percentage is a number or ratio that represents a fraction of 100.
The change in price is
2.92 - 2.85 = 0.07
The increase percentage is
[tex]p=\frac{0.07 \times 100}{2.85}\\ \\p=2.456[/tex]
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