Question

A rectangular lawn 80 m X 60 m has two roads each 10 m wide running in middle of it, one parallel to length and other parallel to the breadth. Find the cost of gravelling the roads at Rs. 1.20 per sq. metre.

Answer 1

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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 $\times$ 60 m has two roads each 10 m wide running in the middle of it.

Dimension of two roads are $80\times 10$ and $60\times 10$

Area of two roads = $80\times 10+60\times 10-10\times 10$

$=800+600-100$

= 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 $\times$ cost per sq. meter

$=1300\times 1.20$

$=Rs.1560$

$\therefore$ The cost of gravelling them at Rs. 1.20 per sq. meter = Rs. 1560