Answer :

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


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