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Mathematics

Ramesh wants to get ₹ 6,050 from a bank after 2 years. If the bank gives 10% p.a. compound interest, then the amount of money he has to keep now in the bank is:

  1. ₹ 5,500

  2. ₹ 5,000

  3. ₹ 5,600

  4. ₹ 5,800

Compound Interest

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Answer

Given,

A = ₹ 6,050

R = 10%

n = 2 years

Let amount he needs to keep be ₹ P.

A=P(1+r100)nA = P\Big(1 + \dfrac{r}{100}\Big)^{n}

Substituting values we get :

6050=P(1+10100)26050=P(100+10100)26050=P(110100)26050=P(1.1)26050=P×1.2160501.21=PP=5,000.\Rightarrow 6050 = P \Big(1 + \dfrac{10}{100}\Big)^{2} \\[1em] \Rightarrow 6050 = P \Big(\dfrac{100 + 10}{100}\Big)^2 \\[1em] \Rightarrow 6050 = P \Big(\dfrac{110}{100}\Big)^2 \\[1em] \Rightarrow 6050 = P (1.1)^2 \\[1em] \Rightarrow 6050 = P \times 1.21 \\[1em] \Rightarrow \dfrac{6050}{1.21} = P \\[1em] \Rightarrow P = ₹ 5,000. \\[1em]

Hence, option 2 is correct option.

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