The front compoun

Radius (r) of wooden sphere = () = 10.5 cm

Surface area = 4 πr²

= 4 * * 10.5 * 10.5

= 1386 cm²

Radius of circular end (r1) = 1.5 cm

Height (h) = 7 cm

CSA = 2 πrh

= 2 * * 1.5 * 7

= 66 cm²

Area of the circular end of cylindrical support = πr²

= * 1.5 * 1.5

= 7.07 cm²

Area to be painted silver = [8 × (1386 − 7.07)]

= (8 × 1378.93)

= 11031.44 cm²

Cost of painting silver color = Rs (11031.44 × 0.25) = Rs 2757.86

Area to be painted black = (8 × 66)

= 528 cm²

Cost for painting with black color = Rs (528 × 0.05) = Rs 26.40

Total cost in painting = Rs (2757.86 + 26.40)

= Rs 2784.26