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you buy six notebooks and a backpack. The cost of the backpack is$ 17.90. You pay 6% in sales tax. Your total bill is $30.74 how much does each notebook cost?
Set this up as an equation to start out. We'll call the a notebook n. First you need to subtract the sales tax from the total price...30.74 - (30.74*.06) = 17.9 + 6n Simplify 28.92 = 17.9 + 6n Subtract 17.9 from both sides. 11.02 = 6n Divide both sides by 6 1.8367 = n (so this is the cost of 1 notebook.)
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