I just checked and Wikipedia cites a budget of 25 to 30 million and a box office gross of 295,7 million, putting it at almost a 1:10 return on investment... not sure where you got the 144 million from? Maybe it's adjusted for inflation but not the 230 million? Ten fold investment seems common in that era for top grossing movies.
Yep. I think I got the wrong number flipping between tabs - I was comparing to various movies, and probably grabbed the budget from the wrong one. My apologies.
The unit ticket sales I worked out hold, however.