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Interpret change in exponential models

Markus sent a chain letter to his friends, asking them to forward the letter to more friends.
The relationship between the elapsed time, tt, in days, since Markus sent the email, and the total number of people who receive the email, P(t)P(t), is modeled by the following function:

Complete the following sentence about the daily percent change in the number of people who receive the email.
Every day,
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}
%\% of people are
the total number of people who receive the email.