<PRE><B>Question 33590</B>
let P be the principle ,R be the interest rate (%),N be the number of years,
then the formula is given by, 

     I  = P*N*R/100
       = 2500 * 1* R/100
     HERE I IS GIVEN ,THAT IS 275,
 
      275 = 25 *1* R  (Simplyfying)

Therefore R = 275 /25
            = 11 %

this is the answer.

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