Principal and Interest Rule (The seven-ten rule) Money invested at 7%per year doubles in approximately 10 years.Also, money invested at 10%per year doubles in approximately 7 years. 1200- 1000 Simple Compound 800 anjeA 600 400 200 0 02 A 681012141618202224 Years Xi CHEN (chenxi0109@bfsu.edu.cn) Investment Science 7/174Principal and Interest Rule (The seven-ten rule) Money invested at 7% per year doubles in approximately 10 years. Also, money invested at 10% per year doubles in approximately 7 years. Xi CHEN (chenxi0109@bfsu.edu.cn) Investment Science 7 / 174