For 1.25b, we get 100m coins. If we lift the cap, we get 125m coins. That's a 25m increase from the 100m (which is a 25% increase).
For 6.25b, we get 100m coins. If we lift the cap, we get 625m coins. That's a 525m increase from the 100m (which is a 525% increase).
Have no clue where you are getting the 400% increase. 400% increase means x5, so I assumed you meant going to the next level.



