David have just borrow $80000 from a bank at an interest rate of 12%p.a.compounded monthly. If he repays $25000 at the end of each month,how much hill he owe the bank at the end of the thrid month?
Mary deposited some money at the bank.She earned $720 simple interest in 18months. If the interest rate was 12%%p.a.,find the principal
答案要有過程 詳細
中3百分率
2007-10-21 3:43 am
回答 (1)
2007-10-21 5:28 pm
✔ 最佳答案
At the end of the first month, the money he owes the bank= $80000 * (1 + 12% / 12) - $25000
= $80000 * 1.01 - $25000
= $55800
At the end of the second month, the money he owes the bank
= $55800 * (1 + 12% / 12) - $25000
= $55800 * 1.01 - $25000
= $31358
At the end of the third month, the money he owes the bank
= $31358 * (1 + 12% / 12) - $25000
= $31358 * 1.01 - $25000
= $6671.58
----------------------------------------------------------------------------------------
Let $x be the principal
x * 12% * (18/12) = 720
x * 0.18 = 720
x = 720 / 0.18 = 4000
The principal is $4000.
收錄日期: 2021-04-13 14:03:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071020000051KK04312