
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 taxi company in a certain city charges according to the following standards:
- Within 4km: $10
- Between 4km and 18km (exclusive): $1.2/km
- Over 18km: $1.8/km
1. Establish a functional relationship between the fare and the distance traveled.
2. If a person travels 20km, how much should they pay?

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