73$ bcus shoe = 15$公仔箱論壇% l$ m. p* V+ h# T, }
the boss paid to customer change = 29$ - p+ y6 K' J7 @+ i' H; H5 _公仔箱論壇 the boss paid back to other ppl = 29$公仔箱論壇& v4 `& N2 J) e2 ^; f s
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so, 15$ + 29$ + 29$ = 73$