More Mock BS? PM Q45 getting, because, purchase, principal

soddy1979

This is so frustrating going over CFAI’s rationale for some of these answers.
Sutherland says he can’t buy IO strips because he can only purchase securities with principal repayments.
CFAI says this is an incorrect statement because IO strips don’t have principal repayments.
Is there some piece of the puzzle I’m not getting here?

RobertA

Another thing I just noticed about the Mock, it’s amateur hour here.
On the explanation of answer 51 their formulas are missing several components/symbols.
=[1.0-( )]/[( )+( )]
I’m pretty sure it’s not supposed to look that way!

LorrinCFA

If u read carefully what sutherland said was correct - he is saying that IO is not an option for him as he wants securities with repayments - which IO’s don’t have - so his statement is correct.

cv4cfa

If u read CFA’s explanation to the answer it says —
Sutherland is incorrect with regard to IO value and correct with regard to principal
repayment.
Don’t know how u r interpreting that CFA is saying it is incorrect.
Also, one of the choice is “… incorrect wrt IO repayments” - and the CFA answer did not chosse that as the correct answer. So what r u reading???