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The cost of gravelling them at Rs. 1.20 per square meter = Rs . 1560

To find the area of roads :

It is given that

a rectangular lawn 80 m × 60 m has two roads each 10 m wide running in the middle of it.

Dimension of two roads are

80×

10

and

60×

10

Area of two roads =

80×

10+

60×

10−

10×

10

= 800+ 600− 100

= 1300 sq. meter

To find the cost for gravelling

It is given that

The cost of gravelling the at Rs. 1.20 per sq. meter.

Therefore total cost = total area × cost per sq. meter

= 1300× 1.20

= Rs.1560

∴ The cost of gravelling them at Rs. 1.20 per sq. meter = Rs. 1560

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