
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
On a certain day, the production volumes of four types of dairy products, A, B, C, and D, in a dairy factory are 2000 boxes, 1250 boxes, 1250 boxes, and 500 boxes, respectively. Determine the number of type B dairy products in a sample of size 60 selected using a stratified sampling method based on production volumes.

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