A certain sum of money is invested and compounded annually. That sum increases to 4 times, in 4 years. In how many years, the sum increases to 16 times the principle amount?
maths is subject which is fun loving and which checks one ability logically
bharat ratna
"The gaming of numbers is called maths.So participate in this wonderful game and explore in it,learn in it and enjoy in it.Then only you can pass in this wonderful game."