21+50+15=86
# i7 K* a( W6 I; R$ t p Y6 X/ ~why 86...5.39.217.76% ~) P" ^" m- V5 A- w. u" J
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
0 z& F5 G* v% c/ ?0 h# l. bthen he giv bck his fren 50. I$ Z, _5 K( D& W, M
and the shoes cost is 15
]2 w5 A( i. [; ]0 e" Htvb now,tvbnow,bttvb
+ q" M/ x3 B, ], F6 j# m公仔箱論壇so total he loss is 86...! q1 d4 h" i5 l1 d- O( r
8 n- {& J- V2 `4 s |4 J[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |