Radius of hemispherical bowl = 3.5 cm Curved surface area of the hemisphere = 2πr2 = 2×
22
7
×(3.5)2 =
44
7
×12.25=77cm2 As bowl is to be painted inside and outside, thus total surface to be painted = 2×77=154cm2 Now,cost of painting 10cm2=Rs.5 ∴ ost of painting 154 cm2=