Question

gas costs $2.53 per gallon in May. In September, gas cost $3.05 per gallon. What was the percent change in the cost of a gallon of gas?

Answer 1

First, find the difference:
$3.05 - $2.53
= $0.52
Take the positive difference and divide with the original price:
0.52 / 2.53
= 0.2055(bunch of numbers)
Then, multiply that by 100 or move the decimal 2 places to the right.
20.55 (rounded)
Your answer is:
20.6%

Answer 2

20.6%

Explanation:

To calculate the percentage of how much increase, we must first know how much is the difference in the price of May with that of September.

That difference will represent how many $ increase the gallon

`3.05-2.53=0.52`

We know that a $ 0.52 increase now we must calculate to what percentage of the initial price this value is equivalent to know in what percentage the price of May increased.

`2.53 \longrightarrow 100\%\\0.52 \longrightarrow x\\x=((0.52)(100))/(2.53) \\x=20.6\%`