Find the percentage increase or decrease in each of the following.
(a)15 increases to 20
(b)10 increases to 11
(c) 8 increases to 22
(d)12 decreases to 8
(e)16 decreases to 10
(f )25 decreases to 14.25
Maths Homework...(急...!!!10點!)
2006-12-07 3:43 am
回答 (4)
2006-12-07 4:16 am
✔ 最佳答案
a.20-15/15*100%=5/15*100%
=100/3%
b.11-10/10*100%
=1/10*100%
=10%
c.22-8/8*100%
=14/8*100%
=175%
d.12-8/12*100%
=4/12*100%
=100/3%
e.16-10/16*100%
=6/16*100%
=37.5%
f.25-14.25/25*100%
10.75/25*100%
=1075/2500*100%
=1075/25%
=43%
Done!!!!!!!!11
2006-12-06 20:19:03 補充：
(f)is wrong,this is right: 25-14.25/25*100% =10.75/20*100% =1075/2500*100% =1075/25%←is not 1075/25% is (1075/25)% =43%
2006-12-07 3:54 am
應該用這方程式:
原值x percentage= 新值
so,
a.133%
b.110%
c.275%
d.66%
e.62.5%
f.57%
原值x percentage= 新值
so,
a.133%
b.110%
c.275%
d.66%
e.62.5%
f.57%
2006-12-07 3:49 am
increases=加
decreases=減
a)15+20
=35
b)10+11
=22
c)8+22
=30
d)12-8
=4
e)16-10
=6
f)25-14.25
=10.75
decreases=減
a)15+20
=35
b)10+11
=22
c)8+22
=30
d)12-8
=4
e)16-10
=6
f)25-14.25
=10.75
參考: 天才數學英文家
2006-12-07 3:48 am
133%
110%
250%
66%
62.5%
46%
110%
250%
66%
62.5%
46%
收錄日期: 2021-04-23 19:33:03
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061206000051KK03495