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 answer: A) 7 years B) 5 years C) 2 years D) 4 years E) 9 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?