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aha..it's based on WAC not the passthrough rate! So, the CMO collects $2,975,868 from mortgages, keeps (8.125%-7.5%)/12*$400M = $208k for themselves, and pay the tranches $2.5m in interest. But something is missing... They collected $2,975,868, paid out $2,500,000, they still have $475,686, of which they kept only $208k...if my math is right, there is still money left!

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