1.

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?1). 298242). 362843). 416244). 26244

Answer»

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


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