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total cost = 8 + 10
  k" Y3 \, Y% h1 c+ _2 S8 a5.39.217.77:8898total sales = 9 + 11
1 \% D, Y$ o  l! b) B5.39.217.77:8898
6 X* V$ s+ _8 H% d. k5.39.217.77:8898total profit = 20 - 18 = 2
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