Answer

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**Hint:**In this type of question we have to choose one person’s amount as variable “$X$” and rest are calculated by converting all in the form of variable $X$.

**Complete step-by-step answer:**

Let the amount with Aman be Rs. $X$, because we have to find how much money Aman will have.

Now according to the question Aman gave $40\% $ of the amount he had to Rohan.

Amount received by Rohan = $40\% $ of $X$

That is $\dfrac{{40 \times X}}{{100}}$

Now amount received by Sahil is $\dfrac{1}{4}$of Rohan’s amount

So total amount received by Sahil = $\dfrac{1}{4} \times \dfrac{{40 \times X}}{{100}}$

Total amount received by Sahil = $\dfrac{X}{{10}}$

Now the question says that after giving Rs.$200$ to the taxi driver Sahil have Rs.$600$as remaining amount

So $600 + 200 = \dfrac{X}{{10}}$

$800 = \dfrac{X}{{10}}$

By using cross-multiplication in above equation

From this we get $X = 8000$

And we choose $X$ as the amount of Aman, therefore we get an amount of Aman as Rs.$8000$.

**Option B is the correct answer.**

**Note:**This is the basic question of linear equations in one variable. Linear equations in one variable are always in the form of \[ax + b = c\]. In this type of question do not take more than one variable that creates a solution complicated.

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