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the price of a gallon of unleaded gas was $2.86 yesterday. today, the price fell to $2.79. find the percent decrease. round answer to the nearest tenth of a percent

1 Answer

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so.. 2.86 - 2.79 is the amount in decrease or 0.07

so.. if we take 2.86 as the 100%, how much is 0.07 of that in percentage?

well
\bf \begin{array}{ccllll} amount&\%\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 2.86&100\\ 0.07&x \end{array}\implies \cfrac{2.86}{0.07}=\cfrac{100}{x}

solve for "x"
User Julie L
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