
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
Determine the total cost David had to pay for his cell phone plan, given a basic monthly fee of $30, a cost of $0.10 per text message, and a cost of $0.15 for each minute over a standard usage of 20 hours, after sending 150 text messages and using the phone for 21 hours.

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