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A sum of Rs. 2500 becomes Rs. 8100 in 2 years at a certain rate of compound interest. What will be the sum (in Rs.) after 4 years?
- A29824
- B36284
- C41624
- D26244
Answer not set
Discussion 1
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CCommunity
Principal = 2500 & Amount = 8100
As we know, A = P (1 + r/100)2
⇒ (1 + r/100)2 = 81/25
⇒ 1 + r/100 = 9/5
⇒ r = 80%
Amount after 4 years
A = 2500 (1 + 80/100)4
⇒ A = 2500 × 9/5 × 9/5 × 9/5 × 9/5
∴ A = 26244
As we know, A = P (1 + r/100)2
⇒ (1 + r/100)2 = 81/25
⇒ 1 + r/100 = 9/5
⇒ r = 80%
Amount after 4 years
A = 2500 (1 + 80/100)4
⇒ A = 2500 × 9/5 × 9/5 × 9/5 × 9/5
∴ A = 26244