
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 certain model of glasses. First, the price is increased by 9 times the purchase price, and then a "50% discount plus a 20 yuan taxi fare" promotion is advertised. Selling a pair of these glasses still yields a profit of 300 yuan. What is the purchase price of this model of glasses?

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