In a certain pond, 40 fish were caught, tagged, and returned to the pond. A few days later, 40 fish were caught again, of which 2 were found to have been tagged. If the percent of tagged fish in the second catch approximates the percent of tagged fish in the pond, what`s the approximate number of fish in the pond?
Choose the correct answer
A) 400 B) 800 C) 1250 D) 2500 E) 10 000
The percent of tagged fish in the second catch is 2/40*100= 
<gadget id="calculator">2/40*100</gadget>
<output>5</output>
5%.   We are told that 5% approximates the percent of tagged fish in the pond. Since there are 40 tagged fish, then we have 0.05x= 40 --&gt; x = 800.   Answer: 800.
<result>B</result>
In a certain pond, 40 fish were caught, tagged, and returned to the pond. A few days later, 40 fish were caught again, of which 2 were found to have been tagged. If the percent of tagged fish in the second catch approximates the percent of tagged fish in the pond, what`s the approximate number of fish in the pond?