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A YouTube channel has 500 subscribers in 2025. Each year, the number of subscribers increases by \(10\pourcent\) due to organic growth, and it gains 100 new subscribers from promotions.
Let \((u_n)\) be the sequence corresponding to the number of subscribers to the channel in 2025 + \(n\).
  1. How many subscribers will there be in 2026?
  2. How many subscribers will there be in 2027?
  3. For all \(n\in\N\), express \(u_{n+1}\) in terms of \(u_n\).
    \(u_{n+1}=\)