
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 high school has a total of 1600 students, with 520 freshmen, 500 sophomores, and 580 seniors. To conduct a survey on the consumption habits of the students by sampling 80 individuals, it is important to consider that there are significant differences in spending habits between grades, but minimal differences within the same grade. What sampling method should be used? How many seniors should be surveyed?

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