Suppose an empty container is initially filled with pure milk. The milk is let out and when the container is 1/4th emptied, it is topped up with water until it is completely full. The liquid is again let out until the container is half-empty, and then filled with water once more, and let out again after full. Calculate how much the container must be emptied before it is refilled with water so that the remaining amount of milk in the container is 9(3/8)%.