The average cost of a gallon of gas during July was $2.45.  The average cost of a gallon of gas during August was $2.78.  What is the percent of change in the average cost of a gallon of gas from July to August?  Round to the nearest whole percent.


To find the percent change in the average cost of a gallon of gas from July to August, we can use the formula for percent change:

\[
\text{Percent Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100
\]

### Given Values:
- Old Value (July) = $2.45
- New Value (August) = $2.78

### Step 1: Calculate the Difference
\[
\text{Difference} = 2.78 - 2.45 = 0.33
\]

### Step 2: Plug the Difference into the Percent Change Formula
\[
\text{Percent Change} = \frac{0.33}{2.45} \times 100
\]

### Step 3: Perform the Calculation
\[
\text{Percent Change} = 0.1347 \times 100 = 13.47
\]

### Step 4: Round to the Nearest Whole Percent
\[
\text{Percent Change} \approx 13\%
\]

The percent change in the average cost of a gallon of gas from July to August is **13%**.

Would you like more details or have any questions?

Here are some related questions you might find interesting:
1. What is the formula for calculating the percent decrease in a price?
2. How do you calculate the percentage increase over multiple months?
3. If the cost of gas decreases from August to September, how would you find the new percent change?
4. How does the percent change formula differ from calculating simple difference?
5. What role does rounding play in percent change calculations?

**Tip:** Always check whether you need to round the percentage value to the nearest whole number or to a specific decimal place as per the problem's requirement.

The average cost of a gallon of gas during July was $2.45. The average cost of a gallon of gas during August was $2.78. What is the percent of change in the average cost of a gallon of gas from July to August? Round to the nearest whole percent.

Learn how to calculate the percent change in the average cost of a gallon of gas from July ($2.45) to August ($2.78) using the percent change formula. This step-by-step guide is suitable for students in Grades 6-8 and covers essential arithmetic concepts.

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