Assuming Trump received 15 million instead of 1 million ignores that the money might have been designated except for 1 million.
Nonetheless, let’s use the 15 million figure. Potus said at the outset of the last election that his holdings were all worth 10 billion. That means he grew his inheritance from 15 million to 10 billion. That’s a 667% increase.
If I inherited $1,000,000. from my parents, I’d have to grow it to 667,000,000 to match what Trump did.
No matter how you look at it, he did a great job.
And that doesn't count "profits" paid to employees. He made jobs for people besides fund managers (Suck it Robert Reich).