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100块呀~~~
197... wat is the answer?
' N+ z. e: ]( [! e7 c) Dtvb now,tvbnow,bttvb" W  Z0 |, f6 k* U
boss's loss:
9 s" f& U. V) D+ L1 U  C5.39.217.77:8898100 return to neighbour
. J* I: C0 z9 c5 Z+ ~3 |5.39.217.77:889879 return to buyer- y$ M6 T; r# \& g7 x% C
18 cost of product8 T7 z) h7 f5 o" U4 @
= 197
197
y 97 R??????
197
97...
97蚊
100+79+18
197????
100(cash)+18(cost)
100(cash)+97(change)+18(cost)+3(profit)
197 or 200
197-200
200-197
Thank you
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