The monthly salary of Mr.Chan is $40000. Every month he spends $15000 on rent, $8000 on food and $5000 on other items. Besides, Mr.Chan has to keep $4000 every month for paying tax. He will save the rest. If Mr.Chan's monthly salary is increased by 6% but the rent is increased by 8%, while all other expenses remain the same, find the change and percentage change in his savings per month.
(P.S:唔該幫幫手啦,,,,趕住交,,,,)
怎樣可以清楚寫出step?
2007-01-03 7:08 pm
回答 (3)
2007-01-03 7:15 pm
✔ 最佳答案
the change:[40000x (1+6%)-15000(1+8%)-8000-5000-4000]-[40000-15000-8000-5000-4000]
=9200-8000
=1200
Savings is increased by $1200 per month
%change:
(9200-8000)/8000
=1200/8000
=15%
Percentage change of his savings is increased by 15% per month
參考: myself
2007-01-03 8:06 pm
Former savings:
$40,000 - ($15,000 + $8,000 + $5,000 + $4,000) = $8,000
New savings:
$40,000 X 1.06 - ($15,000 X 1.08 + $8,000 + $5,000 + $4,000) = $9,200
Therefore,
a) Change in savings is
$9,200 - $8,000 = $1,200 (increase)
b) Percentage change is
1,200 / 8,000 x 100% = 15% increase
$40,000 - ($15,000 + $8,000 + $5,000 + $4,000) = $8,000
New savings:
$40,000 X 1.06 - ($15,000 X 1.08 + $8,000 + $5,000 + $4,000) = $9,200
Therefore,
a) Change in savings is
$9,200 - $8,000 = $1,200 (increase)
b) Percentage change is
1,200 / 8,000 x 100% = 15% increase
2007-01-03 7:28 pm
40000 X 106% - (15000 X 108% + 8000 + 5000+4000)
=42400 - (16200 + 8000 + 5000+4000)
=42400 - 33200
=9200
THIS IS THE SAVINGS NOW
40000 - (15000 + 8000 + 5000 + 4000)
=8000
THIS IS THE SAVING BEFORE
(8000 ÷ 9200) X 100%
=(86又23分之22)%
THIS IS THE PERCENTAGE CHANGE IN HIS SAVINGS PER MONTH
9200 - 8000
=1200
THIS IS THE CHANGE IN HIS SAVINGS PER MONTHS
=42400 - (16200 + 8000 + 5000+4000)
=42400 - 33200
=9200
THIS IS THE SAVINGS NOW
40000 - (15000 + 8000 + 5000 + 4000)
=8000
THIS IS THE SAVING BEFORE
(8000 ÷ 9200) X 100%
=(86又23分之22)%
THIS IS THE PERCENTAGE CHANGE IN HIS SAVINGS PER MONTH
9200 - 8000
=1200
THIS IS THE CHANGE IN HIS SAVINGS PER MONTHS
收錄日期: 2021-04-12 17:44:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070103000051KK00936