
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 policy of targeted poverty alleviation in the country, the black fungus produced by a village enterprise has obtained the national green food standard certification. This certification has made the black fungus of the village enterprise more competitive in the market. This year, the selling price of black fungus per kilogram has increased by $20$ compared to last year. It is expected that this year's sales volume will be four times that of last year, with an annual sales revenue of $360$ million yuan. It is known that last year's annual sales revenue was $60$ million yuan. What was the annual sales volume of black fungus for the village enterprise last year in tens of thousands of kilograms?

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