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total cost = 8 + 104 W% ?# o0 \0 s
total sales = 9 + 11
4 P  j5 s4 |, E% R5 D( F( T5.39.217.770 P' Q3 c; u5 k5 P$ l1 K! X
total profit = 20 - 18 = 2
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