數條MATHS =0=

http://i293.photobucket.com/albums/mm67/zaza520/0002-74.jpg
6.
增加百分數
= [(630 - 600)/600] x 100%
= 5%

7.
減少百分數
= (450/3000) x 100%
= 15%

8.
新月薪
= $16000 x (1 + 3%)
= $16480

9.
未加薪前薪金
= $18000/(1 + 20%)
= $15000

10.
今年居民數目
= 4000 x (1 - 10%) 名
= 3600 名

11.
原來成本
= $212/(1 + 6%)
= $200

http://i293.photobucket.com/albums/mm67/zaza520/0003-53.jpg
12.
原來售價
= $112/(1 - 20%)
= $140

13.
百分增減
= [(3000 - 2400)/2400] x 100%
= +25%

14.
百分增減
= [(72 - 90)/90] x 100%
= -20%

15.
(a)
數目相差
= 900 x 8%
= 72 張

(b)
今年椅子數目
= 900 - 72
= 828

http://i293.photobucket.com/albums/mm67/zaza520/0004-48.jpg
5.
盈利
= $33 - $30
= $3

6.
虧蝕
= $8000 - $6000
= $2000

7.
(a)
盈利
= $2000000 x 10%
= $200000

(b)
售價
= $2000000 x (1 + 10%)
= $2200000

8.
(a)
敏琪的盈利百分率
= [(120 - 100)/100] x 100%
= 20%

子釗的盈利百分率
= [(65 - 50)/50] x 100%
= 30%

(b)
子釗的盈利百分率較大

9.
(a)
共得錢
= $110 x (12 - 2)
= $1100

(b)
盈利百分率
= [(1100 - 1000)/1000] x 100%
= 10%

10.
(a)
美玲的虧蝕百分率
= [(1500 - 1350)/1500] x 100%
= 10%

智豐的虧蝕百分率
= [(500 - 400)/500] x 100%
= 20%

(b)
美玲的虧蝕百分率較小
=