- A₹3,020.44
- B₹3,829.44
- C₹3,819.44
- D₹3,883.44
Show answer
Concept: Consecutive-year CI amounts differ by one year's interest on the earlier amount.
- Rate = (7920 − 6600)/6600 × 100 = 1320/6600 × 100 = 20%.
- Amount after 3 years: P × (1.2)³ = 6600 → P × 1.728 = 6600.
- P = 6600 ÷ 1.728 = ₹3,819.44.
Trick: (6/5)³ = 216/125, so P = 6600 × 125/216 = 8,25,000/216 ≈ 3819.44.
Answer: (C) ₹3,819.44
अवधारणा: लगातार वर्षों के मिश्रधनों का अंतर = पिछले मिश्रधन पर एक वर्ष का ब्याज।
- दर = (7920 − 6600)/6600 × 100 = 20%।
- 3 वर्ष का मिश्रधन: P × (1.2)³ = 6600 → P × 1.728 = 6600।
- P = 6600 ÷ 1.728 = ₹3,819.44।
ट्रिक: (6/5)³ = 216/125, अतः P = 6600 × 125/216 ≈ 3819.44।
उत्तर: (C) ₹3,819.44
