By the end of this section I can...
-calculate the percentage of change
Khan Academy Videos and Interactive Practice:
https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-word-probs-pre-alg/v/growing-by-a-percentage
https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-word-probs-pre-alg/v/solving-percent-problems
https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-word-probs-pre-alg/e/discount_tax_and_tip_word_problems
https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/percent-word-probs-pre-alg/e/markup_and_commission_word_problems
Other Resources:
http://www.mathsisfun.com/numbers/percentage-change.html
http://www.mathgoodies.com/lessons/percent/change.html
https://www.ixl.com/math/grade-7/percent-of-change