
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]


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Given that the world population at the end of 1999 was approximately 6 billion and the annual average growth rate is \( x \% \). Find the function \( y \) in terms of \( x \) that represents the world population at the end of 2009, where \( y \) (in billions) is the population.

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