
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
In 2016, the Chongming District government invested 80 million yuan to launch a new rural tourism project focusing on leisure sports. The plan is to continue investing 20 million yuan annually in this project starting from 2017. In the years to follow, the net income of the project in 2016 was 5 million yuan, and it is predicted that for a considerable number of years, the annual net income will increase by 50% based on the previous year's income. Let the year 2016 be the first year, and $f(n)$ be the cumulative profit from the first year to the $n$-th year ($n \in N^*$) (note: including the $n$-th year, cumulative profit = cumulative net income - cumulative investment, in million yuan), and when $f(n)$ is positive, it is considered that the project is profitable.
1. Try to find the expression for $f(n)$;
2. According to the forecast, from which year will the project start to be profitable continuously? Please explain your reasoning.

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