Which of the following best models the exponential population growth of rats from 20 to 25 in 2 years?

by

A. P=5t+20
B. P=20(5)t
C. P=20(1.25)^t
D. None of these

🧠 Explanation (Math):

Given: Population from 20 to 25 in 2 years; choose exponential model
Step 1: If time unit is “2 years”, growth factor per unit $=1.25$.
Step 2: Model $P=20(1.25)^t$ with $t$ in 2-year units fits $P(1)=25$.
Final Answer: $P=20(1.25)^t$