SAT考试将于2016年改革，SAT官方College Board于2015年1月9日释放新SAT考试最新样题，
A biology class at Central High School predicted that a local population of animals will double in size every 12 years. The population at the beginning of 2014 was estimated to be 50 animals. If P represents the population n years after 2014, then which of the following equations represents the class’s model of the population over time?
正确答案：D
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