The national average cost for gas in the year 2000 was $1.51 a gallon. Currently, the average for a gallon of gas is $3.57. What is the percent of change?
120% increase
150% increase
136% increase
77% increase
The percent of change can be calculated using the formula: ((new value - old value) / old value) * 100%.
Using this formula, we can calculate the percent of change:
((3.57 - 1.51) / 1.51) * 100% = 136%.
Therefore, the correct answer is 136% increase.