A milk container of height of 16 cm is made of a metal sheet in the form of a frustum of a cone with radii of its lower and upper ends as 8 cm and 20 cm respectively. If the approximate cost of milk at the rate of Rs. 22 per litre which the container can hold is Rs.___?

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answer is A.

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Detailed Solution

Concept: In order to answer this issue, we must determine the price of the milk that the container can carry at the rate of Rs. 22 per litre. In order to calculate the volume of milk that a container can hold, we must first determine the capacity of the container. The concept to solve this problem is to know the volume of the frustum is calculated using the formula

Using the formula

Putting

Now, we know that 1 litre=

or we can say

Vol in litres

cost of 10. 45942 litres milk = (Volume of milk)

Cost of 10. 45942 litres milk =

Therefore, the approximate cost of milk is Rs. 230. 10.
Hence, the correct answer is option (1).

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