The money invested in a company is compounded continuously. If $₹ 200$ invested today becomes $₹ 400$ in 6…

The money invested in a company is compounded continuously. If $₹ 200$ invested today becomes $₹ 400$ in 6 years, then at the end of 33 years it will become ₹
  1. $1600 \sqrt{2}$
  2. $3200 \sqrt{2}$
  3. $12800 \sqrt{2}$
  4. $6400 \sqrt{2}$

Solution

Here, Amount $(A)=₹ 400$ Principal $(P)=₹ 200, N=6$ years $\begin{aligned} & A-P\left(1+\frac{R}{100}\right)^N \\ & \Rightarrow 400=200\left(1+\frac{R}{100}\right)^6 \\ & \Rightarrow\left(1+\frac{R}{100}\right)^6=2 \\ & \Rightarrow 1+\frac{R}{100}=2^{\frac{1}{6}} \\ & \begin{aligned} A & =P\left(1+\frac{R}{100}\right)^N \\ & =200\left(1+\frac{R}{100}\right)^{33} \\ & =200\left(2^{\frac{1}{6}}\right)^{33} \\ & =200\left(2^5 \cdot 2^{\frac{1}{2}}\right) \\ & =200(32 \sqrt{2}) \\ & =6400 \sqrt{2} \end{aligned} \end{aligned}$

Asked in: MHT CET 2023 (14 May Shift 1)

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