The radius of the base of a cylindrical column of a building is 25 cm and its height is 3.5 m. It costs Rs 15.50 per sq m to paint this column. What will it cost to paint 10 such column?
Radius of base r= 25cm
Height h= 3.5m = 350cm
Total Surface Area of column to be painted= curved Surface Area
Curved Surface Area
Cost of painting 1 column
=Rate of painting wall× Area per wall
=Rs 85.5
For painting 10 walls= 85.25× 10=852.5 Rs
Total cost = Rs 852.5
5