Chapter 1 - Whole Numbers - 1.9 Reading Pictographs, Bar Graphs and Line Graphs - 1.9 Exercises - Page 86: 8

9250 stores

From the chart, we observe that Mcdonalds has 28 symbols while Walmart only has 9.5. The difference in numbers of symbols is: $$ =28-9.5 =18.5$$ Since each symbol represents 500 stores, the difference in the number of stores is: $$ =18.5 \cdot 500= 9250$$