The least number of complete years in which a sum of money put out at 20% compound interest will be more than doubled is:

The least number of complete years in which a sum of money put out at 20% compound interest will be more than doubled is:

The least number of complete years in which a sum of money put out at 20% compound interest will be more than doubled is:


A. 3
B. 4
C. 5
D. 6

Answer:  B