From a container having pure milk, 20% is replaced by water and the process is repeated thrice. At the end of the third operation, the milk is?
Choose the correct choice.
A) 45%	B) 49.6%	C) 51.2%	D) 55%	E) 60.3%
Let the total quantity of original milk = 1000gm   Milk after 1st operation = 80% of 1000 = 800gm   Milk after second operation = 80% of 800 = 640gm   Milk after third operation = 80% of 640 = 512gm   Strength of final mixture = 51.2%   Answer is 51.2%
<result>C</result>
From a container having pure milk, 20% is replaced by water and the process is repeated thrice. At the end of the third operation, the milk is?