Answer: 41%
Step-by-step explanation:
The change in fish count = \(850-500=350\)
The percent decrease when a fish count goes down from 850 to 500 is given by :-
\(\text{Percent decrease}=\frac{\text{Change in fish count}}{\text{Previous fish count}}\times100\\\\\Rightarrow\text{Percent decrease}=\frac{350}{850}\times100\\\\\Rightarrow\text{Percent decrease}=41.176470588\%\approx41\%\)
Hence, the approximate percent decrease when a fish count goes down from 850 to 500= 41%
