Answer
The blanks are:
$$ 5 \\ 500 \\ 5\cdot 500=2500$$
Work Step by Step
We first count the number of symbols in the GAP row on the chart. Doing this, we find that there are 5 stores.
We need to know how many stores each symbol represents. We see from the legend that for all stores, each symbol represents 500 stores.
We multiply the number of symbols by the number of stores per symbol to get the total number of stores:
$$5\cdot 500=2500$$
