邱先生每月開支佔其薪金的75%,其餘的用作儲蓄,已知他每月開支$9375
a求每月儲蓄金額
b他把過去一個月的儲蓄金額分成兩部分,其中60%以年利率2%計算單利息,餘下的則按季計算複利息.已知10年後,兩部分的金額的比例興現時恰好相反,求以複利息計算的年利率 (答案準確至最接近的0.01%
中五數學-百分率問題
2009-01-07 9:12 pm
回答 (3)
2009-01-07 9:38 pm
✔ 最佳答案
a) 每月薪金 = $9375/75% = $12500每月儲蓄金額 = 薪金*(1-75%) = $12500*25% = $3125
b) 十年後第一部份(40%):
$3125*60%*(1+2%)*10 = $19125
十年後的總儲蓄 = $19125/40% = $47812.5
十年後第二部份(60%):
$3125*(1-60%)*(1+r/4)^40 = $47812*60%
$1250*(1+r/4)^40 = $28687.5
(1+r/4)^40 = 22.95
1+r/4 = 1.081483
r/4 = 0.081483
r = 0.32593
所以複利息計算的年利率 = 32.59%
2009-01-08 2:03 am
a) 薪金: $9375除75%=$12,500
儲蓄: $12,500-$9375=$3125
b) 我冇時間打啊! = 32.59啊^^
儲蓄: $12,500-$9375=$3125
b) 我冇時間打啊! = 32.59啊^^
參考: 我係P.6!
2009-01-07 9:23 pm
A.
邱先生每月薪金: $9,375 / 75% = $12,500
邱先生每月儲蓄金額: $12,500 - $9370 = $3,125
邱先生每月薪金: $9,375 / 75% = $12,500
邱先生每月儲蓄金額: $12,500 - $9370 = $3,125
收錄日期: 2021-04-27 14:45:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090107000051KK00544