21+50+15=865.39.217.76( z& D& i7 M% G
why 86...* W b! E( E! C3 K' X. m6 n+ \
becos he change 50 "small money" then giv bck to customer 29 and he keep the balance 21TVBNOW 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。, z( Y* H$ i( W8 \; e+ v: H7 B0 q, T) G
then he giv bck his fren 50
# e( [7 N3 o2 ^9 M1 w. Z" P2 p公仔箱論壇and the shoes cost is 15" Y# r! W0 a. Z! r
& R. l2 t4 I2 g! S3 P% x1 H/ uTVBNOW 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...5.39.217.76, I5 u p) @8 z/ L- ?
( v& b) i% O8 y
[ 本帖最後由 ooichse 於 2008-12-3 01:54 AM 編輯 ] |