What is slowly getting rich? 1 * 1.1^8 = 2.14358881 —— Doubling in less than 8 years with a 10% annual growth 1 * 1.2^4 = 2.0736 —— Doubling in less than 4 years with a 20% annual growth 1 * 1.3^3 = 2.197 —— Doubling in less than 3 years with a 30% annual growth Mathematics tells me this.