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The price of gasoline is currently 3.45, this is a 21% increase from a year ago. What was the price of gas a year ago.

Solution

The price of gasoline is currently 3.45, this is a 21% increase from a year ago. What was the price of gas a year ago.

Solution

Amount before addition : 2.85123 \dots

Solution steps

Translate the problem into an equation:

3.45 = x + 0.21 x

3.45 = x + 0.21 x : x = \frac{345}{121}

\frac{345}{121} = 2.85123 \dots

Amount before addition : 2.85123 \dots

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