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512

20% off of 640

= 20% discount applied to 640

= 640 - (20% * 640)

= 640 - (0.20 * 640)

= 640 - 128

= 512

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2012-08-20 22:34:49
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A polynomial of degree zero is a constant term

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2013-03-20 03:23:36

20 percent off 6.40 = 5.12= 6.40 - (20% * 6.40)

= 6.40 - (0.20 * 6.40)

= 6.40 - 1.28

= 5.12

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Q: What is 20 percent off of 640?
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