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Suppose you want to buy 100 pens. You can buy 100 pens at a 10% discount at one store where the price is $3.99 per pen. And you can also buy 100 pens at a 15% discount at another store where the price is $4.27 per pen. What is price per pen at the first and second store?
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Extraneous information: 100 pens. Store 1: \[Price_{pen1} = $3.99 - $(3.99*.10) = $3.99*.90 = $3.591\]\[Price_{pen2} = $4.27 - $(4.27 * .15) = $4.27*.85 = $3.6295\]
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