20. Determine the cost of the wall

The diameter of the paint roller is 56 $cm$, and its length is 65 $cm$. It takes 150 complete revolutions to paint the wall. Determine the cost of painting the wall $₹$7 per square metre.

 

 

Cost of painting the wall $=$ $₹$1219120112501160

 

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