
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
(Science question) (This question is worth 12 points)  
A real estate developer invested 810,000 yuan to build an office building. The renovation cost in the first year was 10,000 yuan, which increased by 20,000 yuan each subsequent year. The office building was rented out, generating an annual rental income of 300,000 yuan.  
(1) If the investment and various renovation costs are deducted, from which year does the developer start to make a net profit?  
(2) After several years, the developer wants to invest in other projects and has two options: ① Sell the building for 460,000 yuan when the average annual profit is the highest; ② Sell the building for 100,000 yuan when the total net profit is the highest. Which option results in more profit?

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