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To find out how many finches the population grew by each year, you need to divide the total increase in finches by the number of years.
Given that the population increased by 75 finches over 3 years, you would calculate it as follows:
\[
\text{Increase per year} = \frac{\text{Total increase}}{\text{Number of years}} = \frac{75 \text{ finches}}{3 \text{ years}} = 25 \text{ finches per year}
\]
So the population grew by **25 finches** each year. The correct response is:
**25 finches**