
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 store sells a batch of shirts, with an average daily sales of 20 pieces and a profit of $40 per piece. In order to increase sales and profits, the store implemented a price reduction measure. Assuming that within a certain range, for every $1 decrease in the unit price of the shirts, the store can sell 2 more pieces on average per day. If after the price reduction, the store makes a daily profit of $1250 from selling this batch of shirts, how much did the price of the shirts decrease by?

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