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Railways PYQCBT 1 2016

RRB NTPC · Question 100

At what percentage simple interest per annum a certain sum will double in 10 years? A. 7% B. 8% C. 9% D. 10%

  1. B

  2. A

  3. D

  4. C

Show answer & explanation

Answer: (C) D

Explanation

A sum doubles when the simple interest equals the principal: P × R × 10/100 = P, so R = 10%.