这个知识点在讲义哪里？在考纲范围里吗？

问题如下：

A pool consists of three mortgages:

1. USD 100,000 mortgage with 330 months to maturity and a 4% rate

2. USD 200,000 mortgage with 310 months to maturity and a 5% rate

3. USD 300,000 mortgage with 290 months to maturity and a 6% rate

Calculate the WAC and WAM.

选项：

解释：

WAC is

100/600×4%+200/600×5%+300/600×6% = 5.33%

WAL (months) is

100/600×330+200/600×310+300/600×290 = 303.33

一个资产池里有三个mortgage：

1，本金100kUSD，330个月到期，利率4%

2，本金200k，310个月，利率5%

3，本金300k，290个月，利率6%

求WAC与WAM

weight average cost=100/600×4%+200/600×5%+300/600×6% = 5.33%

weighted average maturity=100/600×330+200/600×310+300/600×290 = 303.33