
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given that Lingling District received approximately 6.4 million domestic and foreign tourists in 2018 and 8.1 million in 2020, calculate the average annual growth rate of tourists in these two years.

Present the answer in LaTex format: \boxed{Your answer}
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