There are 8 columns in a hotel hall. The perimeter of the bottom surface of each column is 25.12dm and the height is 7m. How much does it cost to paint these columns (10.5 yuan per square meter)

There are 8 columns in a hotel hall. The perimeter of the bottom surface of each column is 25.12dm and the height is 7m. How much does it cost to paint these columns (10.5 yuan per square meter)


25.12/3.14=8(dm)
8/2=4(dm)
Square of 3.14 * 4 = 50.24 (DM2)
3.14*8*70=1758.4(dm2)
(50.24*2+1758.4)*8*10.5