# A man donates 10 aluminium buckets to an orphanage . A bucket made of aluminium is of h=20cm and has its upper and lower end of r=36cm and 21 cm . Find the cost of preparing 10 buckets if the cost of aluminium is rs 42 per 100 cm sq

### Asked by thunderboyshubharth2005 | 13th Mar, 2021, 01:54: PM

Expert Answer:

### Bucket in the shape of Frustum of a cone.
Given: r = 21 cm, R = 36 cm, h = 20 cm
Surface area of one bucket where r is radius of bottom circular surface, R is radius of top surface, h is height and l is slant height given by
Surface area of one bucket
So, surface area of 10 buckets
So, the cost of aluminium sheet
$l=\sqrt{{\left(R-r\right)}^{2}+{h}^{2}}$

### Answered by Renu Varma | 15th Mar, 2021, 02:47: PM

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