20. Determine the cost of the wall

The diameter of the paint roller is 42 \(cm\), and its length is 48 \(cm\). It takes 350 complete revolutions to paint the wall. Determine the cost of painting the wall \(₹\)7 per square metre.

 

 

Cost of painting the wall \(=\) \(₹\)1570151115521601

 

[Note: Round off the cost to the whole number]