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Question

The following tables gives the quantity of rice and its cost.

Quantity of rice (in kg) 4 6 8 10
Cost of rice in ₹ 200 300 400 500
Plot the graph of quantity of rice and its cost and find the cost for 14 kg of rice.

A
₹700
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B
₹600
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C
₹800
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D
₹750
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Solution

The correct option is A ₹700
Take a suitable scale on both the axes
Here, we take on the x axis 1 cm = 2 kg,
on the y axis 1 cm = ₹100.
● Mark number of kg of rice along the x -axis.
● Mark the cost of rice along the y-axis.
● Plot the points (4,200) (6,300) (8,400) (10,500).
● Join the points.

To find the cost of 14 kg of rice.
Mark 14 on the x-axis, follow the line parallel to y-axis
through 14 till we meet the drawn line at P. From P we take a horizontal line to meet the y-axis. This meeting point of y-axis is the required answer.
Thus, the cost of 14 kg of rice is ₹700.

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