
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
In a class of 100 students, 40% initially enjoyed a sports activity and 60% did not. By the end of the semester, 80% enjoyed the activity and 20% did not. Determine the difference between the maximum and minimum possible values of $y\%$, the percentage of students who changed their opinion about the sports activity throughout the semester.

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