
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 store sells a product, which costs 10 yuan to purchase, for 18 yuan each. When sold at this price, 60 units are sold per day. It has been observed that for every 1 yuan increase in the selling price (from the base price of 18 yuan), the daily sales volume decreases by 5 units; conversely, for every 1 yuan decrease in the selling price (from the base price of 18 yuan), the daily sales volume increases by 10 units. To maximize daily profit, what should be the selling price per unit?

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