21+50+15=86
) w8 j# U5 O* {) t! _8 J [why 86...
0 G) s- N4 b2 Q! I2 ^: L5 J z5.39.217.76becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21' m5 S! H; t B' @! j8 j' d
then he giv bck his fren 50
" e$ I' T% R( n! t( s5 O0 A) R; i! Ktvb now,tvbnow,bttvband the shoes cost is 15
4 \0 {3 `' T% L T/ P
* ?$ E$ F# a7 O8 A1 L7 [5.39.217.76so total he loss is 86...0 k( s: F, e0 H. n# b8 E' p/ ?5 c9 C
5.39.217.76! w2 ]( |; J& I9 p* L( ]! q
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |