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total cost = 8 + 10公仔箱論壇* `/ \( S( {% T8 M6 C/ z- u" x
total sales = 9 + 11
  {$ a" m. j) h6 c" `+ P5 Y3 q5.39.217.775.39.217.77  E1 A- J2 \$ d- W4 [. G1 {
total profit = 20 - 18 = 2
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