If a sum of money double itself in 20 years. What is the rate of simple interest per cent per year ?

If a sum of money double itself in 20 years. What is the rate of simpl

1.	If a sum of money double itself in 20 years. What is the rate of simple interest per cent per year ?
A.	4%
B.	8%
C.	5%
D.	10%
Answer» D. 10%

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