At what annual rate of interest will ₹2400 become ₹3120 in 5 years at simple interest?
किस वार्षिक ब्याज दर (Rate of interest) पर ₹2400, 5 वर्षों में ₹3120 हो जाते हैं?
Answer और ExplanationAnswer and explanation
Answer: (B) 6%
साधारण ब्याज (SI) = 3120 − 2400 = ₹720
R = SI × 100P × T = 720 × 1002400 × 5 = 7200012000 = 6%
✓
वार्षिक ब्याज दर (Rate of interest) 6% है।
SI = 3120 − 2400 = ₹720
R = SI × 100P × T = 720 × 1002400 × 5 = 7200012000 = 6%
✓
The rate is 6% per annum.
SMART APPROACH
2400 का 10% = 240, तो 720 = 30%। 5 वर्ष में 30% यानी हर वर्ष 6%।
720 is 30% of 2400 (since 10% = 240). 30% in 5 years means 6% a year.
Source: Selection Post Phase XIV (10th) · 24 Sep 2026 · Shift 3। Solution: Prashant Sir, Vijayastra।Source: Selection Post Phase XIV (10th) · 24 Sep 2026 · Shift 3. Solution by Prashant Sir, from Vijayastra.