https://www.ixl.com/math/grade-5/percent-of-a-number
http://www.mathabc.com/math-5th-grade/percentage/how-much-discount-do-you-get/id/392
https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-intro-pre-alg/v/taking-a-percentage-example
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