Immunization (Cushion spreads and such) number, returns, manager, problems, couple

pimpineasy

I know there has been a lot of talk on this on the boards, but just wanted a quick answer here:

For each problem when they talk about "the manager has an acceptable return of 5%". Where does this number play in any of the calculations at all? I have done a couple of problems and never once had to use there acceptable returns.....

Lemme know and thx in advance!