SOLUTION: in what time will a sum of money double itself at 5 % simple interest per annum?

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Question 664318: in what time will a sum of money double itself at 5 % simple interest per annum?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

growing 5%=5%2F100=0.05 per year and it needs to reach 100%=100%2F100=1 to be double.
Therefore, 0.05x+=1
x+=1%2F0.05
x+=20 years