Schweser Mock PM Q51

Hi:

The answer provided in the mock doesn’t explain clearly why they only add the payments up to 900 days. I thought this interest rate collar is for 3 years not just 2.5 years.

Thank you

Funny was just looking at the same question. No idea why they didn’t include the final payment at 1080 days. Seems like the answer should be B rather than A. Any help would be appreciated. Thanks