SOLUTION: How long will it take for an investment to double at 3% a year. Simple interest rate. ( I know this easy and the answer is 20 but I can not figure out how to get it)

Question 1068716: How long will it take for an investment to double at 3% a year. Simple interest rate. ( I know this easy and the answer is 20 but I can not figure out how to get it)
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Simple interest,

So the future value would be,

.
.
.
If it's compounded interest,

.
.
.
Neither equals 20.

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