21+50+15=86
/ K7 [9 F0 v) J8 x3 wwhy 86...公仔箱論壇3 O D1 f" U' s, C2 t* C4 m+ B3 Q
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
|3 x/ n' E' X' ]# q5 d. H/ h- h公仔箱論壇then he giv bck his fren 50
7 f# w' X$ T2 Y- s2 h# z9 k- [and the shoes cost is 15
8 w+ Z; G( }$ b- |
7 Q) O& P9 T; D/ h% v8 \5 O) ?8 PTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。so total he loss is 86...
% p8 ?( s! L5 x: S公仔箱論壇
$ ~8 C2 |! s4 T* L. d" atvb now,tvbnow,bttvb[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |