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  9. Q90

RRB NTPC 2022 · Question 90 of 110

A certain sum amounts to ₹22,494 in 7 years at x% per annum on simple interest. If the rate of simple interest per annum had been (x + 4) %, the amount payable after 7 years would have been ₹25,917. Find the sum invested.

  1. A₹11,975
  2. B₹12,275
  3. C₹12,175
  4. D₹12,225Correct

Answer: D. ₹12,225

Explanation

Rate of interest per annum in 1st case =x% Rate of interest per annum in 2nd case =(x+4) Let the Sum =100y. ATQ- 100y+7xy =22494 7xy =22494-100y … (1) In the second case – 100y+7xy+28y=25917 128y+7xy =25917…put the value of eq (1) 128y+22494-100y=25917 28y=3423 Y=122.25 Total Sum =100×122.25 =12225.

Source: RRB NTPC 2022 CBT 2 Previous Year Paper (12-June-2022) — ixambee compilation with answer key · reliable-secondary

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