Discussion
If in the next 10 years, the population of wild animals in Antarctica will increase by 2·5% more than that in the rest of the world, what will be the percentage population of wild animals in Antarctica after 10 years ?
Answer: D
The answer is Cannot be determined.
Antarctica now has 8% of the wild animals. The question says its population will grow 2·5% more than that of the rest of the world, but it never says how fast the rest of the world grows.
Antarctica's future share depends on both growth rates. If the rest of the world stayed level, Antarctica's 8 units would grow to 8.2 and its share to about 8.2%; with other growth rates the share changes again. None of 9·5%, 10·5% or 15·7% can be fixed without the missing rate.
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