In 1992, Jason bought a gallon of gas for $1.25. Yesterday, he brought a gallon of gas for $2.25. What is the percentage increase of the price of a gallon of gas for $2.25. What is the percentage increase of the price of a gallon of gas from 1992 to yesterday? If necessary round to the nearest tenth of a percent.

The percentage increase of the price of a gallon of gas from 1992 to yesterday is 80%.

First, to find the percentage increase, you want to subtract the original price ($1.25) from the new price ($2.25) to find the increase.

$2.25 - $1.25 = $1.00

Then, you want to divide the original price ($1.25) from the increase ($1.00) and multiply by 100. We multiply by 100 to convert the decimal to a percent.

1.00 : 1.25 * 100 = 80%

The percentage increase of the price of a gallon of gas from 1992 to yesterday is 80%.