what is the formula for percent increase/decrease?

when driving past the gas station earlier, i noticed that gas was $2.18 a gallon. on my way back home, the gas was $2.48 a gallon. what was the % increase in the price of gas rounded to the nearest tenth?

Percentage increase in the price of gas rounded to the nearest tenth in 13.8%

Percent increase and percent decrease are measures of percent change, which is the extent to which a variable gains or loses value

The figures are arrived at by comparing the initial (or before) and final (or after) quantities according to a specific formula.

The formula for percentage increase\decrease is given as:

If the result is positive, it represents increase in percentage

If the result is negative, it represents decrease in percentage

Given that I noticed that gas was $2.18 a gallon

On my way back home, the gas was $2.48 a gallon

So here initial value = 2.18 and final vlaue = 2.48

Thus % increase in the price of gas rounded to the nearest tenth in 13.8%

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