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Railways PYQCBT 1 2016

RRB NTPC · Question 82

What sum will produce the same interest in 9 years at the rate 8% simple interest as Rs. 800 produce in 3 years at 9/2% per annum?

  1. Rs. 100

  2. Rs. 125

  3. Rs. 150

  4. Rs. 110

Show answer & explanation

Answer: (C) Rs. 150

Explanation

Interest on Rs 800 for 3 years at 4.5% = 800 × 4.5 × 3/100 = Rs 108. The sum needed at 8% for 9 years: P × 8 × 9/100 = 108, so P = 108 × 100/72 = Rs 150.