Given that internal diameter of hollow hemisphere (r) = 21/2 cm = 10.5cm
External diameter (R) = 25.2/2 = 12.6 cm
Total surface area of hollow hemisphere
Given that cost of painting 1cm2 of surface = 10 ps
Total cost for painting 1843.38cm2
=1843.38 x 10 ps
Total cot to paint vessel all over = 184.338 Rs.