The price of gasoline rose from $2.50 per gallon to $2.95 per gallon. What was the percent increase in price?

Through subtraction (of $2.50 from $2.95), you can find the amount of the increase: $0.45.

Form the ratio $0.45 / $2.50; the numeric value is 0.18.

Multiply this by 100% to obtain the final answer: 0.18 (100%) = 18%