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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
  1. Rs. 281.60
  2. Rs. 290
  3. Rs. 340.50
  4. Rs. 500

A
Rs. 290
B
Rs. 500
C
Rs. 281.60
D
Rs. 340.50
Solution
Verified by Toppr

T.S.A. of cyl =2πrh+2πr2=2π×(35100)×1.25+2π(35100)2
TSA=3.52m2 & as cost of 1m2 is Rs 80
Total cost =3.52×80=Rs281.6

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