For Chen Cheng, thirty means interest—the interest rate.
From 3,000, to 100,000, to a million, to ten million, and then to over a hundred million...
An ever-increasing amount of principal, an endless stream of interest.
With money generating money, compounded interest calculations made Chen Cheng exclaim:
This money can't be spent! Absolutely can't be spent! For a lifetime, I can't finish spending it!