algebra word question

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A chemist has four solutions of a very rare and expensive chemical that are 15% acid (cost $120/oz), 20% acid (cost $180/ oz), 35% acid (cost $280/oz) and 45% acid (cost $359/oz). She requires 200 ozof a 29% acid solution. Find the combination of any two of these concentrations that will minimize the total cost of the mix

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