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To solve this problem, we need to calculate the percentage change between the average sales of stores "أ", "ب", and "ج" in 2014 compared to 2013.

### Step 1: Extract the relevant data from the chart
- For 2013 (blue bars), we have:
  - Store "أ": 85
  - Store "ب": 75
  - Store "ج": 95

- For 2014 (purple bars), we have:
  - Store "أ": 105
  - Store "ب": 80
  - Store "ج": 115

### Step 2: Calculate the average sales for each year
- **Average sales in 2013**:
  \[
  \text{Average 2013} = \frac{85 + 75 + 95}{3} = \frac{255}{3} = 85
  \]

- **Average sales in 2014**:
  \[
  \text{Average 2014} = \frac{105 + 80 + 115}{3} = \frac{300}{3} = 100
  \]

### Step 3: Calculate the percentage change
The formula for percentage change is:
\[
\text{Percentage Change} = \left( \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \right) \times 100
\]

\[
\text{Percentage Change} = \left( \frac{100 - 85}{85} \right) \times 100 = \left( \frac{15}{85} \right) \times 100 \approx 17.65\%
\]

Thus, the percentage increase in average sales from 2013 to 2014 is approximately 17.65%.

### Conclusion:
There seems to be no direct match with the answer options. However, there may be a different interpretation or an error in the dataset used. Would you like to explore further?

Here are some relative questions to expand on this concept:

1. How can we calculate the percentage change for individual stores?
2. What would be the percentage if only one store had a change in sales?
3. How can we calculate the overall percentage change when more than three stores are involved?
4. How would the result change if sales were significantly different in one year?
5. Can this method be used to calculate percentage changes over different periods?

**Tip**: Always double-check the data when calculating averages or percentage changes to avoid mistakes due to rounding or misinterpretation.

The percentage change for the average sales of stores 'أ', 'ب', and 'ج' in 2014 compared to 2013?

Calculate the percentage change in the average sales of stores 'أ', 'ب', and 'ج' from 2013 to 2014. This problem involves averaging and percentage change, with detailed steps for solving using real sales data.

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