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The quantity of iron - sheet to make a b...

The quantity of iron - sheet to make a boy a of right circular conical shape is `75(3)/(7)` sq-m. if the slant height of it 5 m, then calculate the volume of air in the boya and its height. Determine of the expenditure to colour the whole surface of the boya at the rate of rupees 2.80 per square - metres. [The width of the iron - sheet not to be considered while calculating.]

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