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Railways PYQCBT 2 2017

RRB NTPC · Question 79

The simple interest at R % p.a. on a certain principal P is (9/16)^th of P. If R is equal to the number of years (N), find the value of N.

  1. 8.5

  2. 7

  3. 7.5

  4. 6

Show answer & explanation

Answer: (C) 7.5

Explanation

SI = P × R × N/100 = 9P/16 with R = N. So R²/100 = 9/16, R² = 56.25 and R = N = 7.5.