
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 stationery store bought 100 pens at a price of $a$ yuan each, and then sold them at a markup of $20\%$. After selling half of the pens, the remaining pens were sold at a discount of $20\%$ based on the current price. Calculate the total profit of the stationery store.

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