Monthly payment formula:
A = P (r (1+r)^n) / ( (1+r)^n -1 )
eg.,
P = $10,000 (比如汽车贷款 10000刀)
r = 7.5% per year / 12 months = 0.625% per period (0.00625 on your calculator)
n = 5 years x 12 months = 60 total periods
10,000 (.00625 x (1.00625^60) / ((1.00625^60) - 1)
10,000 (.00625 x 1.45329) / (1.45329 - 1)
10,000 (.00908306 / .45329)
10,000 (.02003808) = $200.38
Monthly payment for car’s loan term would be $200.38.
如果只付利息的情况:
Loan payment = loan balance x (annual interest rate/12)
= 10000x 7.5%/12 = $62.50
在实际操作中,计息/利率计算可以用360/360,365/360,365/365,360/365,具体采用哪种要看你的合同。
当年做全球最大的核心银行系统实施的时候,贷款模块光是利息计算就30000多个案例。测试团队测出的大部分IR其实都是用户理解错误。
也可以用计算器算,要先分别推导出Compound monthly和Compound semi annually的monthly payment公式。推导过程如下: -iloveresort(秋水长天); 2011-8-19 (532 bytes. #6865255@0)