
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
In September this year, the Ministry of Education issued a "Notice on Carrying Out Energy Saving and Emission Reduction Actions in Schools." Implementing the recycling of textbooks is an important measure to realize the spirit of the notice. According to estimates, if all primary and secondary school students in China implement the recycling of textbooks, then the nation could save at least 31,680,000,000 yuan in book fees every year after deducting the average cost. Represent this book fee using scientific notation in yuan.

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