Find the least number of complete years in which a sum of money put out at 25% compound interest will be more than double of itself?	Choose the correct choice:
A) 6 years B) 7 years C) 9 years D) 4 years E) 1 years
4 years   Answer: 4 years
<result>D</result>
Find the least number of complete years in which a sum of money put out at 25% compound interest will be more than double of itself?