Trump doesn't have any real business acumen...he simply got off to a great start thanks to his father.
Vince. I can't find how much Trump really inherited from his father. Some articles say 30 million, others say 200 millions.
Adjusted for inflation, 30 millions and 200 millions in 1971 have the same purchasing power as 184 millions and 1.2 billions in 2017, respectively.
However, Trump has a networth of 4 billions. That's a considerable difference.
So, in the best case scenario, Trump has an average annual return of roughly 11.2% and in the worst case scenario a 6.7%.
I'm not an expert, but I would think he's one hell of an investor. (Not as good as you thou).