a) 4 : 3 : 5
b) 5 : 6 : 10
c) 6 : 5 : 10
d) 10 : 5 : 6
Answer: b
Explanation: Let their initial investments be x, 3x and 5x respectively
$$ = {\text{A}}:{\text{B}}:{\text{C}}$$
$$ = \left( {x \times 4 + 2x \times 8} \right)$$ : $$\left( {3x \times 4 + \frac{{3x}}{2} \times 8} \right)$$ : $$\left( {5x \times 4 + \frac{{5x}}{2} \times 8} \right)$$
$$\eqalign{
& = 20x:24x:40x \cr
& = 5:6:10 \cr} $$
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