
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 certain commodity has a cost price of $20$ yuan per unit. A survey shows that if it is sold at a price of $x$ yuan per unit $(20\leqslant x\leqslant 30$, and $x$ is an integer) during a certain period of time, $(30-x)$ units can be sold. To maximize profit, the selling price per unit of the commodity should be ______ yuan.

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