Answer:
C. 15%
Explanation:
The percentage of the increase can be calculated using the following equation:
[tex]\frac{V_f-V_i}{V_i}\times100\text{ \%}[/tex]Where Vf is the final price of a gallon of gas and Vi is the initial price of a gallon of gas. So, replacing Vf by $2.25 and Vi by $1.95, we get that the percentage of increase is equal to:
[tex]\frac{2.25-1.95}{1.95}\times100\text{ \% = 15.38\%}[/tex]Therefore, the answer is C. 15%
