Answer: 8.39%
Explanation:
Margin = Net Income/ Sales
Net income for the company including the new investment:
= 864,000 + (Sales * Contribution margin ratio - Fixed costs)
= 864,000 + (4,200,000 * 30% - 966,000)
= $1,158,000
The combined sales for the company is:
= 9,600,000 + 4,200,000
= $13,800,000
Combined margin:
= 1,158,000 / 13,800,000
= 8.39%