Question
A closed metallic cylindrical box is 1.25 m high and is base radius is 35 cm . If the sheet metal cost Rs. 80 per `m^2` , the cost of the material used in the box is :
Answer: Option A
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Total surface area =` 2 pi r (h + r) = [2 xx 22/7 xx 35/100 xx ( 1.25 + 0.35)] m^2`
= `(2 xx 22/7 xx 35/100 xx 16/19) m^2`
= 3.52 `m^2`
`:.` Cost of the material = Rs. ( 3.52 x 80) `m^2` = Rs. 281.60 .
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