Answer:
I think it is maybe 19% but Idk.
Because 14 would seem to low without work and the other are pretty high so im just guessing.
Here, regrouping is basically carrying.
64+43 shown vertically would be:
64
+43
-------
107
4+3 is 7, so seven is in the ones place, but that's not the point.
60+40 is 100, so you regroup by carrying the one to the hundreds place.
Hope I helped!
The next number would be 3469131825 you just change the last number
hope it helps