A rectangular lawn of dimensions 80 m $\times$ 60 m has two roads each 10 m wide running in the middle of the lawn, one parallel to the length and the other parallel to the breadth. What is the cost of traveling the two roads at Rs.3 per sq m?
Rs.3600
Rs.3700
Rs.3800
Rs.3900
Explanation:
Area = $\left(l + b - d\right)$ d
(80 + 60 - 10)10 => 1300 $m^2$
1300 $\times$ 3 = Rs.3900