某人上月use係食物的支出是$1500,use係服裝的是$2500.這月她在食物和服裝的支出分別減少25%和15%.
(b)她的總支出的百分數增減是多少 ?
幫幫手數學
2006-11-08 5:20 am
回答 (4)
2006-11-08 5:25 am
✔ 最佳答案
new expense = 1500 * (1-0.25) + 2500 * (100.15)=1500*0.75+2500*0.85
=1125+2125
=3250
b. (3250 - 4000)/4000 = -0.1875
drop 18.75%
2006-11-08 9:22 pm
percentage change :
( 1500*(1-25%) + 2500*(1-15%) - (1500+2500) ) / (1500+2500) * 100%
= -750/4000 * 100%
= -18.75%
therefore , there is a percentage decrease for 18.75% in her expenses.
( 1500*(1-25%) + 2500*(1-15%) - (1500+2500) ) / (1500+2500) * 100%
= -750/4000 * 100%
= -18.75%
therefore , there is a percentage decrease for 18.75% in her expenses.
2006-11-08 5:27 am
本月的食物支出=1500X(1-25%)
=$1125
本月的食物支出=2500X(1-15%)
=$2125
因為她的總支出的百分數增減=(新值-舊值)/舊值X100%
=((1125+2125)-(1500+2500))/(1500+2500)X100%
= -18.75%
所以她的總支出的百分數減少18.75%
=$1125
本月的食物支出=2500X(1-15%)
=$2125
因為她的總支出的百分數增減=(新值-舊值)/舊值X100%
=((1125+2125)-(1500+2500))/(1500+2500)X100%
= -18.75%
所以她的總支出的百分數減少18.75%
2006-11-08 5:27 am
上月總支出=$1500+$2500
=$4000
今月食物支出= $1500(1-25%)
=$1125
服裝支出=$2500(1-15%)
=$2125
今月總支出=$1125+$2125
=$3250
總支出的百分數增減= $(3250-4000)/$4000 * 100%
= -750/4000 *100%
= -18.75%
總支出減了18.75%
=$4000
今月食物支出= $1500(1-25%)
=$1125
服裝支出=$2500(1-15%)
=$2125
今月總支出=$1125+$2125
=$3250
總支出的百分數增減= $(3250-4000)/$4000 * 100%
= -750/4000 *100%
= -18.75%
總支出減了18.75%
收錄日期: 2021-04-26 15:35:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061107000051KK04305