Here, h = 10 m
(i) Inner curved surface area = Total cost / Cost of painting per m2
= 2200 / 20 m2 = 110 m2 Ans.
(ii) We have, 2πrh = 110
⇒ 2 × 22 / 7 × r × 10 = 110
⇒ r = 110 x 7/ 2 x 22 x 10 = 1.75 m Ans.
(iii) Capacity of the vessel = π r2h
= 22/ 7 × 1.75 × 1.75 × 10 m3 = 96.25 m3
= 96.25 kl Ans. [1 m3 = 1 kl]