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The first thing to note is that percent means that number over 100. Thus 2.5% can be rewritten as 25/100. The second thing is that "of" in mathematics means "multiplied by." For example, 4 groups of 9 means 4x9. In this case the question can be expressed as 25/100 x 50,000,000. This calculation comes out as 12,500,000. Therefore 2.5% of 50 million is 12.5 million.

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13y ago

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