Your fuel expense last year is said to be 800 dollars. That's for your annual total. Now, this year, It increased to 960 dollars. Maybe the fuel gets price increased. Anyways, we need to solve for the percentage increased of your fuel price from last year to this year. => 960 dollars - 800 dollars = 160 dollars=> 160 dollars / 800 dollars = 0.2 => 0.2 * 100% = 20% is the increased of your fuel expense.