But it's harder to say that taking the trouble to spell the number out "three" could be part of the typo. Therefore, I think the ratio is correct but the math is wrong. They took an old document and revised it.

I looked at the metadata of the PDF and the CREATION date of the document was back on May 16, 2011 - this means they have taken that original document and revised it every year to make the new Notice document. This document was last MODIFIED on May 6, 2015 at 12:58 pm, even though it is dated April 27, 2015.