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 A sum of money at simple interest amounts to Rs 815 in 3 years and Rs 854 in 4 years. What is the sum invested?

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CSIR CERI JSA Official Paper-I (Held On: 2022)
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  1.  Rs. 650
  2. Rs. 690
  3.  Rs. 698
  4. Rs. 700

Answer (Detailed Solution Below)

Option 3 :  Rs. 698
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Detailed Solution

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Given:

Amount after 3 years = Rs 815.

Amount after 4 years = Rs 854.

Formula Used:

Simple Interest (SI) = Principal (P) × Rate (R) × Time (T)

Amount (A) = Principal (P) + Simple Interest (SI)

Calculation:

Interest for 1 year = Rs 854 - Rs 815 = Rs 39

Interest for 3 years = 39 × 3 = Rs 117

Principal (P) = Rs 815 - Rs 117

Principal (P) = Rs 698

The sum invested is Rs 698.

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Last updated on May 21, 2025

->The CSIR Junior Secretariat Assistant Provisional Response Sheet has been released on 21st May 2025 at the official website.

-> The CSIR Junior Secretariat Assistant Notification 2025 written examination dates has been released for Advt No. CRRI/02/PC/JSA-JST/2025.

-> Candidates had applied online from 22nd March to 21st April 2025.  

-> The CSIR JSA salary ranges from INR 19,900 - INR 63,200 (Indian Institute of Petroleum, Dehradun) and INR 35,600 (Indian Institute of Toxicology Research).

-> The selection of candidates for this post will be based on a Written Exam, followed by a Computer Typing Test.

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