數學,,勁急,,唔要式plz!!!!20點\口/!!!

1.

租金=$14000-$6000=$8000

租金既支出佔小明每月入息既百分之幾=租金/每月既入息X100%
=$8000/$14000X100%
=57.14%


2.
每本成本=售價-盈利=$60-$20=$40

盈利百分率=盈利/成本X100%=$20/$40X100%=50%


3.
大強所得=小明所得/60%=$40/0.6=$66.67

筆錢共有=小明所得+大強所得=$40+$66.67=$106.67

4.
a.每個橙既成本=$500/1000=$0.5

b.小明所得的盈利百分率=盈利/買價X100%
=(賣價-買價)/買價X100%
={(0.2X1000X$1.5 + 0.8X1000X$1.2)-$500}/$500X100%
=(($300+$960)-$500)/$500X100%
=152%

5.
設Z=唱片售賣超過一萬張以上之數

花紅=$244000-$200000=$44000=ZX$110X1%

Z=$44000/$1.1=40000

賣出數量=10000+Z=14000

2009-01-01 20:14:50 補充：
更正;
5. 賣出數量 = 10000+40000=50000 (不是14000)

1)(14000-6000)/14000*100%
=57又1/7%
2) 20/(60-20)*100%
=50%
3)40+40/60%
=$106.7
4a) 500/1000=$0.5
4b) [(1000*20%*1.5+1000*80%*1.2)-500]/500*100%
=152%
5)(244000-200000)/(110*1%)+10000
=50000

1. 14000分之6000乘100%
=44又7分4
2. 60分之20乘100%
=33又3分1
3. 40+40÷60%
=106又3分2
4. a 500÷1000
= 0.2
b 500分之(1000乘20%乘1.5 + 1000乘80%乘1.2)乘100%
= 252%
5. (244000-200000)÷(110乘1%)+10000
=49639

2009-01-01 19:55:10 補充：
sor
第5題條式是對的
答案應該是
213636

1.3/7
2.1/3
3.144
4a. 0.5
4b.760
5.213636萬

1. 42.86%
2. 66.67%
3. 144
4a. 0.5
4b. 76%
5. 213636