You gotta add up how much exp you first used, 1 book is 1 million exp.
1st Reinc : 800 mil ( 800 books )
2nd Reinc: 2600 mil ( 2600 books )
3rd Reinc: 5700 mil ( 5700 Books )
Total: 9100 Mil ( 9100 Books )
60% Inherit : 5460 books
80% Inherit : 7280 books
When you're this far into reincarnation and inheriting, I don't suggest using nothing but 80% inherits