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The compound interest on a sum of Rs.15,000 at 15% p.a. for \(2\frac{2}{3}\) years, interest compounded annually, is (nearest to Rs.1):
1. Rs.6,795
2. Rs.6,815
3. Rs.6,781
4. Rs.6,821

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Best answer
Correct Answer - Option 4 : Rs.6,821

Given:

Principal = Rs. 15,000

Rate% = 15% p.a compounded annually

Time = 2(2/3) years

Formula used:

Amount = P × (1 + r/100)2(1 + 2r/300)

Calculation:

∵ Rate% for 2/3 years = 15% × (2/3)

= 10%

∴ Amount = P × (1 + r/100)2(1 + 2r/300)

= 15,000 × (1 + 15/100)2(1 + 10/100)

= 15,000 × (1 + 3/20)2(11/10)

= 15,000 × (23/20)2(11/10)

= (15000 × 529 × 11)/(400 × 10)

= Rs. 21,821.2

∴ CI = Amount - Principal

= 21,821.2 - 15,000

= Rs. 6821.2

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