
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
Residents in a certain area are charged for their domestic water usage as follows: for a monthly water usage of up to $20$ cubic meters, the rate is $a$ yuan per cubic meter; for any usage exceeding $20$ cubic meters, the rate is $\left(a+3\right)$ yuan per cubic meter. Determine the water bill for a household that used $25$ cubic meters of water last month.

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