
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
The zoo has launched a "One Day Tour" activity with two ticket purchasing options:  
① $150 per adult, $60 per child;  
② For groups of 5 or more people (including 5), $100 per person.  
Now, there are 4 adults and 7 children planning to visit the zoo. Think about the most cost-effective way to buy tickets.

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