Question: 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.

 Option A: 2,000

 Option B: 1,800

 Option C: 1,900

 Option D: 1,700

 Option E: None of these
Option C