来自《耶鲁大学开放课程：金融理论 第7集 第7集》

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  and then sometimes there are 15 year mortgages,
  也有十五年期的
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  and then there's a whole host of other mortgages
  我们还会讲到很多
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  we're going to come to later
  其他种类的抵押贷款
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  where there's floating interest rates.
  还有带浮动利率的那种
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  So the 30 year mortgage, how much do you have to pay?
  以三十年为例 要付多少钱呢
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  Well, if it were on an annual payment
  如果是按年给付
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  and it were an 8 percent mortgage
  利率为百分之八的
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  for 30 years on a 100,000 dollars,
  共计十万美元的贷款
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  so if it was a 100,000 dollar principle at 8 percent coupon
  如果是这样的话
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  for 30 years we just calculated that you would have to pay,
  我们刚刚算出了结果
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  the payment would be 8,888 dollars a year,
  我们需要付8888美元
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  because 8,888 dollars a year discounted at 8 percent
  算上百分之八的折损一年交8888美元