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If you pay 22.90 dollar for a dvd that includes a 7 per sales tax , what is the price of dvd before sales tax
  1. 21.40 dollar
  2. 23 dollar
  3. 25 dollar
  4. 20.50 dollar
Explanation


A 7% sales tax means:

x + 0.07x = 22.90  

⇒ 1.07x = 22.90  

⇒ x = 22.90 / 1.07 = 21.40


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