A closed metallic cylindrical box is 1.25 m high and its base radius…

Question

A closed metallic cylindrical box is 1.25 m high and its base radius is 35 cm. If the sheet metal costs Rs. 80 per m2, the cost of the material used in the box is :

Accepted Answer

Option A. Rs. 281.60. Answer & Solution Answer: Option A Solution: Total surface area : & = 2 r ( h + r ) & = [ 2 × 227 × 35100 × ( 1.25 + 0.35 ) ] m^2 & = ( 2 × 227 × 35100 × 1610 ) m^2 & = 3.52\, m^2 ∴ Cost of the material : & = Rs . ( 3.52 × 80 ) & = Rs . 281 .60