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

Explanation

Total cost = Rs.198

Rate of painting = `50` paise per `dm^2`

T.S.A = `(198xx100)/50`=`396dm^2`

Let the radius(r) be x and height(h) be 6x.

`T.S.A = 2pir(r+h)`

`396 = 2xx22/7xxx(x+6x)`

`44x^2=396`

`x=3dm`

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