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Multiple choice

A species has an initial population $4^{10}$. At the end of first day, the population increased by $50\%$. At the end of second day, it decreases by the same percentage. If the process continues in the same pattern, the number of days for the population to reach $3^{10}$ is?

  1. $10$
  2. $20$
  3. $50$
  4. $100$
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