Step 1: Understanding the Concept:
We need to calculate the total number of bookstores across all cities in 2024 and then find the percentage that San Francisco's bookstores represent out of this total.
Step 2: Detailed Explanation:
First, sum the number of bookstores for all cities in 2024:
\[ \text{Total}_{2024} = 51 + 80 + 84 + 72 + 76 + 65 + 100 + 70 + 88 \]
\[ \text{Total}_{2024} = 686 \]
The number of bookstores in San Francisco in 2024 is 70.
Now, calculate the percentage:
\[ \text{Percentage}_{SF} = \frac{\text{SF Bookstores}}{\text{Total Bookstores}} \times 100% = \frac{70}{686} \times 100% \]
To check if this is less than 10%, we can compare 70 to 10% of 686.
\[ 10% \text{ of } 686 = 0.10 \times 686 = 68.6 \]
Since 70 is greater than 68.6, San Francisco accounted for more than 10% of the total.
Step 3: Final Answer:
The statement that San Francisco accounted for less than 10% is false.