
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
A unit purchased a vacant lot for 21.6 million yuan, planning to build a building of at least 10 floors, with each floor being 2000 square meters. It is calculated that if the building is built to $x$ ($x \geqslant 10$) floors, then the average construction cost per square meter is $560+48x$ (unit: yuan). To minimize the average comprehensive cost per square meter of the building, how many floors should the building have?

(Note: The average comprehensive cost = average construction cost + average land purchase cost, where the average land purchase cost = $\dfrac{\text{total land purchase cost}}{\text{total construction area}}$)

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