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%