the price of a gallon of unleaded gas has risen to $2.89 today. yesterday's price was $2.83

Answer 1

The percent of increase in the cost of a gallon of gas is as follows:

$2.89 (now)

- $2.83 (yesterday)

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$0.06 increase in cost per gallon

Percent increase = 0.06/2.83

$0.06 is the amount of cents by which the cost increased.

$2.83 was the cost of a gallon of gas before today's increase.

Percent increase = 0.06/2.83 = 2.12% increase in the cost of gas per gallon.

Answer 2

I guess that you are asking for a percent decrease/Increase.

Then, (2.89 - 2.83) / 2.83 = .0212014

so -.0207612457 * 100 = 2.12 %

meaning, it increased by 2.12 % from yesterday price