Quantitative Aptitude Interest Simple Interest

A person borrowed some money on simple interest. After 4 years. he returned \(\frac{9}{5}\) of the money to the lender. What was the rate of interest? 

1
25% p.a. 
2
20% p.a.
3
15% p.a.
4
More than one of the above
5
None of the above

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