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what you need to do is set up a porpotion. 80 over 100 is X over 3900. Then, cross multiply to get 100X = 312000. Finally divide both sides by 100 to get X by its self on one side, so X = 3120.

80% of 3900 is 3120.

Hope this helps.

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Q: What is 80 percent of 3900?
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