How much money did Rockfeller have?

John D. Rockefeller, the well-known millionaire (百万富翁) , gave away millions, but he himself was very mean about small sums of money. One day he went to stay at a hotel in New York and asked for the cheapest room in it.
    The manager showed him into a room and said, "This is our smallest and cheapest room," and added, "but why do you choose a poor room like this? When your son stays here, he always has our most expensive room; yours is the cheapest. "Oh! yes," said Rocke- feller, "but his father is a rich man; mine isn’t. ’