
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 fishing company purchased a fishing boat at the beginning of the year for ¥490,000. The various expenses for the first year were ¥60,000, and each subsequent year the expenses increased by ¥20,000. The annual fishing income was ¥250,000.  
(1) Starting from which year does the company begin to profit?  
(2) After several years, there are two possible treatment plans: Plan ① When the average annual profit is the highest, sell the fishing boat for ¥180,000; Plan ② When the total net income is the highest, sell the fishing boat for ¥90,000. Which plan is more cost-effective?

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