The cost of painting the total outside surface ofa closed cylindrical – InterviewSolution

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1.	The cost of painting the total outside surface ofa closed cylindrical oil tank at 50 paise persquare decimetre is Rs. 198. The height of the tank is 6 times the radius ofthe base of the tank. Find the volume corrected to 2 decimal places.
Answer» TSA`=2pirh+2pir^2` `=12pir^2+2pr^2` `=14pir^2` Cost=TSA0.5=198 `=14pir^20.5=198` `r^2=9` `r=3dm` `h=18dm` V=`pir^2h=3.14918` `=162*3.14dm^3` `=508.68dm^3`.

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