又泥f.1數..爆易

$ 4000000 / 100 = $ 4 0 0 0 0

$ 40000 x ( 1 + 4 0 %) = $ 5 6 0 0 0

$ 56000 x ( 1 - 3 0 %) = $ 3 9 2 0 0

Therefore, marked price of each be $ 3 9 2 0 0

2007-12-30 14:48:36 補充：
Sorry, correction!!商人用$ 4 0 0 0 0 for each商人要賺40%的price = $ 5 6 0 0 0 y x ( 1 - 3 0 %) = $ 5 6 0 0 0 y = $ 8 0 0 0 0商人要比30%折扣比d客人, 仍舊要賺40%的price = $ 8 0 0 0 0Therefore, marked price of each be $ 8 0 0 0 0

80000

$80000

2007-12-30 14:47:11 補充：
樓上咁多人做善事=.="

[ ($4000000 / 100) x (1+40%)] x (1-30%)

=[ $40000 x 140% ] x (1-30% )

=$56000 x 70%

= $39200

4000000*140%*70%=$3920000 for 100部
each = 3920000/100=$39200