21+50+15=86* a' {% `( k5 m* \- \; a
why 86...
9 }# |' u+ s6 @1 E8 Ztvb now,tvbnow,bttvbbecos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21
, y$ K: q& A8 m" M$ ]4 Rthen he giv bck his fren 50. P7 {$ {+ N) q0 z
and the shoes cost is 15tvb now,tvbnow,bttvb" X2 z8 G% R [& t! Z' k
) R7 i6 i6 Z, X0 A& q公仔箱論壇so total he loss is 86...
) q+ N1 j1 ]/ ?9 W0 r3 ^9 h3 A% o2 X/ T ~! S
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |