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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

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

Explanation

Let Price before sales Tax is = x

price after slaes Tax is  = x + 7% = x + 0.07x= 1.07x

According to Given condition: 1.07x = $22.90

                                                              x = 21.40