Surface area of wooden sphere = 4πr2
Radius (r1) ofthe circular end of cylindrical support = 1.5 cm
Height (h)of cylindrical support = 7 cm
CSA of cylindrical support = 2πrh
Area of the circular end ofcylindrical support = πr2 
= 7.07 cm2
Area to be painted silver = [8 × (1386 − 7.07)] cm2
= (8 × 1378.93) cm2 =11031.44 cm2
Cost forpainting with silver colour = Rs (11031.44 × 0.25) = Rs 2757.86
Area to be painted black = (8 × 66) cm2 = 528 cm2
Cost forpainting with black colour = Rs (528 × 0.05) = Rs 26.40
Total costin painting = Rs (2757.86 + 26.40)
= Rs2784.26
Therefore, it will cost Rs 2784.26 in painting in such away.