Selection Post Phase XIV (Graduate)17 Sep 2026Shift 1Simple Interest

A person invested a certain sum of money at 10% per annum simple interest. After 4 years, the interest earned was ₹3,600 less than the sum invested. What was the sum invested?
एक व्यक्ति ने एक निश्चित धनराशि 10% वार्षिक साधारण ब्याज (Simple interest) पर निवेश (Investment) की। 4 वर्षों के बाद अर्जित ब्याज, निवेश की गई राशि से ₹3,600 कम था। निवेश की गई राशि कितनी थी?

Answer और ExplanationAnswer and explanation

Answer: (B) ₹6000

RT = 10 × 4 = 40%, तो SI = P का 40% = 0.4P

P − SI = 3600 ⇒ P − 0.4P = 0.6P = 3600

P = 36000.6 = ₹6000

✓

निवेश (Investment) की गई राशि ₹6000 थी।

RT = 10 × 4 = 40%, so SI = 40% of P = 0.4P

P − SI = 3600 ⇒ P − 0.4P = 0.6P = 3600

P = 36000.6 = ₹6000

✓

The sum invested was ₹6000.

SMART APPROACH

राशि 100% है और ब्याज (Interest) 40%, तो 60% का अंतर ₹3600 है। अतः 10% = 600 और 100% = ₹6000।

The sum is 100% and the interest is 40%, so the gap of 60% is ₹3600. Then 10% = 600 and 100% = ₹6000.

Source: Selection Post Phase XIV (Graduate) · 17 Sep 2026 · Shift 1। Solution: Prashant Sir, Vijayastra।Source: Selection Post Phase XIV (Graduate) · 17 Sep 2026 · Shift 1. Solution by Prashant Sir, from Vijayastra.