1)mary spent $1500on food and $2500on clothinglast month.She reduce her expenditure on food and clothing by 25%and 15%respectively this month.
a)How muchdoes she spend on food and clothing togetherthis month?
b)What is the percentagechangein her total expenditure?
2)Mr Wong saves 15%of his monthly income .If he spends$6800a month.find his annual income in 12 month.
MATH....
2007-01-21 4:01 am
回答 (2)
2007-01-21 4:07 am
✔ 最佳答案
1(a)
The money spend on food
=1500*(1-25%)
=1500*0.75
=1125
The money spend on clothing
=2500*(1-15%)
=2500*0.85
=2125
she spend on food and clothing together this month
=1125+2125
=3250
(b)
the percentage changein her total expenditure
=(3250-4000)/4000*100%
=-750/4000*100%
=-18.75%
2
Mr Wong saves 15% of his monthly income.
This means he spends 85% of his monthly income
he spends $6800 a month
So, the monthly income
=6800/85%
=8000
his annual income in 12 month
=8000*12
=96000
2007-01-21 4:10 am
1.
a)
1500 x (1 - 0.25) + 2500 x (1 - 0.15)
= 3250
she spend $3250 on food and clothing together this month
b)
[(3250 - 4000) / 4000] x 100%
= -18.75% (decreased)
the percentage change in her total expenditure is decreased by 18.75%
2.
[6800 / (1 - 15%)] x 12
= 96000
his annual income in 12 month is $96000
a)
1500 x (1 - 0.25) + 2500 x (1 - 0.15)
= 3250
she spend $3250 on food and clothing together this month
b)
[(3250 - 4000) / 4000] x 100%
= -18.75% (decreased)
the percentage change in her total expenditure is decreased by 18.75%
2.
[6800 / (1 - 15%)] x 12
= 96000
his annual income in 12 month is $96000
收錄日期: 2021-04-25 16:52:24
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