I have heard 110% effort become one of those very common clichés that to me really means nothing.
This sounds harsh I know, after you saying that you will put in 110% effort. That has to seal the deal surely? Surely, you have convinced me to give you that job interview or that job? Well, no, not really, because just making the statement on your CV or cover letter is not enough.
You see, I am anticipating that if you want to work with me in my organisation then you will be bringing me huge amounts of effort anyway as you step on to your career path.
The expression for me is a little tired now anyway. After all, you are unlikely to say that you will bring me 30% effort so why the 110%? It is meaningless.