1.In 1995, the cost of unleaded gasoline was $0.95 per gallon. In 2010, the same type of gasoline costs $3.00 per gallon. To determine the amount of change, we have to use the Solution amount of change = 3 - 0.95 = 2.05 no of years = 2010 - 1995 = 15 so 2.05/15 = 0.13667 per year.