
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 real estate developer invests 810,000 yuan to build an office building. The renovation cost is 10,000 yuan in the first year and increases by 20,000 yuan each year. The building is then rented out, generating an annual rental income of 300,000 yuan.

1. From which year does the developer start to make a net profit after deducting the investment and renovation costs?
2. After some years, the developer wants to invest in other projects and has two options:
   a. Sell the building when the total net profit is maximized at a price of 1,000,000 yuan.
   b. Sell the building when the average annual profit is maximized at a price of 460,000 yuan.
   Which option is better?

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