21+50+15=86 # k. }- _: m' B3 p- Lwhy 86...公仔箱論壇) M8 P) {& B# C5 p
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21公仔箱論壇3 A* B% _4 [+ d3 t: L
then he giv bck his fren 50公仔箱論壇, y+ \0 X+ o0 p7 [
and the shoes cost is 157 Q2 T$ D& j+ F7 q; Z: m
TVBNOW 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。6 K1 E& u3 k$ _& i( z7 ?. L4 m
so total he loss is 86... $ {! V. R; m8 t+ `2 b+ Q" G5.39.217.77:8898 6 N' h% f) v+ @7 T- G5.39.217.77:8898[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ]