The simple interest on a sum of money is 1/9 th of the principal and the number of year is equal to the rate percent per annum. The rate of interest per annum is:

 a) 2 %
 b) 7 %
 c) 9%
 d) 10/3 %


Ans: d.

Solution
Let Principal = x
SI = x/9
R = T;

R =10/3
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