Final answer:
To calculate the percentage increase in the price of gas from $2.20 to $2.31, find the increase ($0.11) and divide by the original price, then multiply by 100 to get a 5.0% increase.
Step-by-step explanation:
The question at hand involves a percentage increase calculation, which is a fundamental concept in mathematics. The process involves finding the difference between the new price and the original price, and then calculating the percentage that this difference represents of the original price.
To find the percentage increase from $2.20 to $2.31 per gallon, one would subtract the original price ($2.20) from the new price ($2.31) to get the amount of increase ($0.11). To find what percent this increase is of the original price, divide $0.11 by $2.20, and then multiply the result by 100. This calculation gives us:
Percentage Increase = (($2.31 - $2.20) / $2.20) × 100
= ($0.11 / $2.20) × 100
= 0.05 × 100
= 5%
Therefore, the percent of increase in the price of gas from $2.20 to $2.31 per gallon is 5.0%, which corresponds to option a.