What is the approximate percent decrease when a fish count goes down from 850 to 500? The percent decrease is approximately 40%.

The percent decrease is approximately 70%.

The percent decrease is approximately 140%.

The percent decrease is approximately 240%.

The percent decrease is approximately 40%.

Step-by-step explanation:

First we need to calculate how many fish we lost.

Do this by taking the new value and subtracting it from the old one.

Now we know that the number of fish that we lost is 350.

To find the percent we have lost just take the number of fish we have lost and divide it by the original amount of fish.

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When we round this we get 0.4 which is 40%, so the first answer is correct.