
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
An investor invested 720,000 yuan in a development zone to build a vegetable processing plant. In the first year, the total expenditure was 120,000 yuan, and the expenditure increased by 40,000 yuan each subsequent year. Starting from the first year, the annual sales income from vegetables was 500,000 yuan. Let $f(n)$ represent the total net profit for the first $n$ years ($f(n)=$ total income for the first $n$ years - total expenditure for the first $n$ years - investment amount).

(Ⅰ) From which year does the factory start to make a profit? (Profit means the total net profit is greater than 0)

(Ⅱ) The investor plans to sell the factory for 480,000 yuan when the annual average net profit reaches its maximum. How many years later will the annual average net profit reach its maximum, and how much total profit will be made by then?

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