Correct Answer: Option C
Let their initial investments be x, 3x and 5x respectively. Then
X : Y : Z = (x * 4 + 2x * 8) : (3x * 4 + 3x/2 * 8 ): (5x * 4 + 5x/2 * 8 ) = 20x : 24x : 40x= 5 : 6 : 10
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