Gas prices in cook county are at $3.30 per gallon. if a market scientist predicts a 20% increase in the price of gas in the coming month, what will the price of gas be?

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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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