What is the approximate percentage difference in average price of petrol in 2004 and 2014?

Answer: Option C

Price of petrol in 2004 = 36.49
Price of petrol in 2014 = 73.70
Average Difference
= $$\frac{\text{Difference between 2004-2014}}{\text{Price of petrol in 2004}}$$      × 100
= $$\frac{37.31}{36.49}$$  × 100
= 102%