the price per gallon of gasoline changes off the most drivers pay close attention to the changes find the percent changes in price for each of these cases increased from $4 per gallon to $4.20
since it went up .20 we are looking for the percentage .20 is out of 4. since .20 is 20% out of 1, divide 20 by 4 to find the new percent which is 5%. therefore the gas prices increased 5%, and the new price is 105% of the original price.
