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Explanation: Amount = P(1 + RT/100) → 8100 = P(1 + 0.36) → P = 8100 / 1.36 = 7200.
Explanation: SI = (P × 9 × 6) / 100 → P = (9720 × 100) / 54 = 18000.
Explanation: SI = (P × 4 × 5) / 100 → 1000 = 20P/100 → P = 5000.
Explanation: To double → 100% interest → 100 / 12.5 = 8%.
Explanation: To triple → gain 200% → rate = 200 / 20 = 10%.
Explanation: SI = (5000 × 8 × T) / 100 = 800 → T = 2.
Explanation: SI = (12000 × 6.5 × 2) / 100 = 1560.
Explanation: SI is directly proportional to time.
Explanation: SI = 7590 - 6500 = 1090 → R = (1090 × 100) / (6500 × 3) = 6%.
Explanation: SI = (4000 × 9 × 2) / 100 = 720 → Amount = 4000 + 720 = 4720.
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