Question

During the Thanksgiving weekend, the price of a gallon of gas went up from $1.95 to $2.25. Your parents say that is a 30% increase. You tell them you have been studying math and they are wrong. About what percent did the price of gas go up? A. 13%B. 14%C. 15%D. None of the aboveI would appreciate your help.

Answer 1

Answer:

C. 15%

Explanation:

The percentage of the increase can be calculated using the following equation:

$\frac{V_f-V_i}{V_i}\times100\text{ \%}$

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:

$\frac{2.25-1.95}{1.95}\times100\text{ \% = 15.38\%}$

Therefore, the answer is C. 15%