A rectangular lawn 70 m × 30 m has two roads each 5 metres wide, running in the middle of it, one parallel to the length and the other parallel to the breadth. Find the cost of gravelling the road at the rate of 4 per square metre.  Choose the correct choice from the following choices.
A) 2,000
B) 1,800
C) 1,900
D) 1,700
E) None of these
Total area of road   = Area of road which parallel to length + Area of road which parallel to breadth – overlapped road   = 70 × 5 + 30 × 5 – 5 × 5   = 350 + 150 – 25   = 500 – 25 = 475 m2   ∴ 1,900ost of gravelling the road   = 475 × 4 = 1900   Answer 1,900
<result>C</result>
A rectangular lawn 70 m × 30 m has two roads each 5 metres wide, running in the middle of it, one parallel to the length and the other parallel to the breadth. Find the cost of gravelling the road at the rate of 4 per square metre.