A man invests Rs. 128 and obtained Rs. 16. The interest obtained by him is: Choose the correct choice from the following answers.
A) 8 %
B) 12 %
C) 12.5 %
D) 16 %
E) 18 %
By investing Rs. 128, income derived = Rs. 16.   By investing Rs. 100, income derived = Rs.(16/128x100)= Rs. 12.5.   ∴ Interest obtained = 12.5 %.   Answer 12.5 %
<result>C</result>
A man invests Rs. 128 and obtained Rs. 16. The interest obtained by him is: