### Home > PC > Chapter 7 > Lesson 7.2.3 > Problem 7-67

7-67.

Continue taking the log of both sides.

'The Rule of 70' is called as such because the number of years to double is close to 70 divided by the annual percent growth rate.

7-67.

Continue taking the log of both sides.

'The Rule of 70' is called as such because the number of years to double is close to 70 divided by the annual percent growth rate.