21+50+15=86
* ^) t( e! V! L; j9 D5 a3 d5 {公仔箱論壇why 86...5.39.217.760 I# r8 }: N( h0 C; L1 p! U! M
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
: g$ E+ i# L" x6 T' ~' ?# _% kthen he giv bck his fren 50
% w+ E% s/ I- y, l6 z2 @and the shoes cost is 15, Q* e4 j) u5 w6 n8 ?
1 Y8 R) x! Z2 k: J& E! G
so total he loss is 86...
/ f% q7 `1 h7 H) t0 U5.39.217.767 c' w8 z+ \! b. G
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |