假设一个利率是4.0另一个是3.5
那么一个要月付2000块,而另一个要付1800块
这时候你每个月还是付2000块.这多出来的200块可以用來付本金也就是principal
当你开始付贷款的时候这1800块里只有200块左右是本金其他都是利息。也就是说一年以后你的贷款只付掉了2400块。尽管从你的荷包里银行掏走了1800*12
Make sure you have no prepayment penalty. And also you need to evaluate your financial status,how long you will stay in one place etc. arm also has its risks such as potentially higher interest rates after 7 or 10 years.in general if you can reduce your principal quickly you can pay off your loan much faster.
I am not a loan expert. Please just take my words as a reference.