Rule of 72 explained: This simple math formula that separates savers from investors; here's how

Compounding is the quiet force that turns steady saving into exponential wealth creation. The Rule of 72 makes this concept ...
Ars Technica

Compound interest is cray

So with my dreams of hitting the big money I went to a compound interest calculator. 75 million sitting in a modest 7% average interest annually for 20 years would give me 290 million. Variance of 3%.