BoxRec

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I reckon Parker will see sense and accept 30%.
No harm in him trying to get more though. He knows he will lose his WBO belt to Joshua so he might as well try and get the most cash possible.

...irrespective of absolute numbers and being well aware that Parker is not worth 10% of the lump sum, I believe Joshua should agree to 30-35 % compromise..

There are two threads that have existed and active for weeks discussing the very same topic.

Next to AJ, Parker fought much better competition as any other champion. His top opponents, like Hughie, Andy and Takam, are almost just as good as Povetkin his ones. So 40 ish % seems logic to me.