At what rate per annum will a sum of money become four times itself in 25 years under simple interest?
साधारण ब्याज (Simple interest) के अंतर्गत 25 वर्षों में कोई धनराशि किस वार्षिक ब्याज दर (Rate of interest) पर स्वयं की चार गुनी हो जाएगी?
Answer और ExplanationAnswer and explanation
Answer: (C) 12%
राशि 4 गुनी होने पर SI = 3P
R = 3P × 100P × 25 = 12%
✓
दर 12% है।
Sum becomes 4 times, so SI = 3P
R = 3P × 100P × 25 = 12%
✓
The rate is 12%.
Source: RRB NTPC (Graduate) · 24 Mar 2026 · Shift 2। Solution: Prashant Sir, Vijayastra।Source: RRB NTPC (Graduate) · 24 Mar 2026 · Shift 2. Solution by Prashant Sir, from Vijayastra.