
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
The formula $N=6 \times 10^{9} \times x^{-2}$ is used to estimate the number of people in a region with an income exceeding $x$ dollars. Determine the minimum income of the top $600$ people.
A) $10^3$
B) $10^{3.5}$
C) $10^4$
D) $10^{4.5}$

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