The cost of painting the total outside surface of a closed cylindrical oil tank at `50` paise per square decimetre is `Rs. 198.` The height of the tank is `6` times the radius of the base of the tank. Find the volume corrected to `2` decimal places.

Explanation

TSA`=2pirh+2pir^2`

`=12pir^2+2pr^2`

`=14pir^2`

Cost=TSA`xx0.5=198`

`=14pir^2*0.5=198`

`r^2=9`

`r=3dm`

`h=18dm`

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