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How Many Butterflies?

APBIO-LIFNKJ

The population that you have chosen to study are monarch butterflies. This species is migratory, and as a result you decide to use the mark and recapture method to estimate the size of the population.

$$\frac { \text{Total Number Captured }}{ \text {Number Marked} } = \text {Total Number Recaptured with Mark}$$

You originally caught and marked 50 monarch butterflies. A month later, you caught 100 butterflies and 10 were already marked.

Which of the following is an estimate of the size of the monarch butterfly population?

"Monarch Butterfly". Wikipedia. N.d. Web. 7 Feb. 2016. https://en.wikipedia.org/wiki/Monarch_butterfly

A

50 butterflies.

B

5000 butterflies.

C

500 butterflies.

D

5 butterflies.