aircraft will always achieve 2,4%.
I presume you realise that this is an instant value and not a constant value, so you will achieve 2.4% at the start of the climb but it can be less at the end of the 2nd segment.... Surprised? So was I when Mr Boeing stated it
Look at far 25.111 and 115 and see if you still think the same thing about the climb gradient.
Mutt