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Joanne cannot decide which of two washing machines to buy. The selling price of each is ​$520. The first washing machine is marked down by 40​%. The second washing machine is marked down by 10​% first and then an additional 30​% off. Find the sale price of each washing machine. Use pencil and paper. Explain why Joanne should buy the first washing machine rather than the second if the machines are the same except for the selling price.