The videos below might also be helpful:
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/v/solving-percent-problems-3
Homework: Exercise 7.2 (page 163) #1(a, b, c) #2, 3 and 4
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