
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
As of 12:00 on May 30, the total donations for earthquake relief received from all sectors of society at home and abroad amounted to approximately 3,990,000,000 yuan. This number can be represented in scientific notation as ____ yuan.

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