Answer :

Upper end radius of frustum = d/2= 28/2 = 14 cm


Lower end radius of frustum = D/2 = 42/2 =21 cm


Height of the frustum = 24 cm


And we know,


The amount of milk that bucket can hold = Volume of the bucket


And, Volume of bucket = Volume of Frustum


Amount of milk that bucket can hold = Volume of frustum


Volume of frustum


Where R = Radius of larger or lower end and r = Radius of smaller or upper end and h = height of frustum π = 22/7


Volume of frustum




= 22 × 8 × 133


Volume of frustum = 23408 cm3


Also we know that 1 litre = 1000 cm3


Volume of frustum in litre = 23408/1000= 23.408 litre


Amount of milk that the bucket hold = 23.408 litre


The cost of milk = Rate of milk × amount of milk bucket holds


The cost of milk = 30 × 23.408


= Rs. 702.24


The cost of milk is Rs.702.24


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