A rectangular lawn 80 metres by 60 metres has two roads each 10 m wide running in the middle of it, one parallel to the length and the other parallel to the breadth. Find the cost of gravelling them at Rs. 30 per square metre.
Options:
A . Rs. 3600
B . Rs. 3900
C . Rs. 36000
D . Rs. 39000
Answer: Option D Area of the roads : = (80 × 10 + 60 × 10 - 10 × 10) m2 = 1300 m2 ∴ Cost of gravelling : = Rs. (1300 × 30) = Rs. 39000
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