$900,000 from is father. http://www.century-of-flight.net/Aviation%20history/pathfinders/Howard%20Hughes.htm Thats a value of $11,377,736.84 today http://data.bls.gov/cgi-bin/cpicalc.pl
Too much money depends on the reference point of the question.
I Don't Know. Probally close to $1
Not much - figure $20 as a decoration to $50 if it is shootable.
$75,000 a year