A President can veto, but a veto can be over ridden by a 2/3 margin.
His life mirrors that of most. It is NOT isolated.
No that is not an isolated example either.
Yes, your math skills suck, especially for a 16 year old who claims to be educated. An increase from 4.5% to 5.5% is actually damned close to a 25% increase. It's easy to figure out, 1% is almost 1/4 of 4.5%, and as such close to 25%.