What is the minimum number of full years required for an amount invested at 25% compound interest to exceed twice its original value?

Explanation

To determine when the principal more than doubles at 25% compound interest, calculate the amount each year: After 1 year, it becomes 1.25 times; after 2 years, 1.5625 times; after 3 years, 1.9531 times; and after 4 years, approximately 2.44 times. Therefore, it takes 4 complete years to exceed twice the initial sum.