The price of a gallon of gasoline has increase, on average from $2.50 in 2006 to $4.00 in 2008. What is the percentage of increase?

60% increase

Step-by-step explanation:

Percentage increase = (new - old) / old * 100

We know the new = 4.00

old = 2.50

Lets substitute the values in

Percentage increase = (4-2.5) / 2.5 * 100

= 1.5/2.5 * 100

=.6*100

=60%