The cost of 2kg of apples and 1 kg of grapes on a day was found to be Rs 160.

Solution:

Let the cost of 1 kg of apples be Rs x.

And, cost of 1 kg of grapes = Rs y

According to the question, the algebraic representation is

$2 x+y=160$

      $4 x+2 y=300$

For $2 x+y=160$,

$y=160-2 x$

The solution table is

For $4 x+2 y=300$

$y=\frac{300-4 x}{2}$

The solution table is

The graphical representation is as follows.