
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
Under the condition that the selling price remains unchanged, if the purchase price of a certain commodity is reduced by 5%, the profit can be increased from the current a% to (a+15)% (an increase of 15 percentage points). Then, calculate the value of a.

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