Answer:
The opearing income will increase by 71,200
Explanation:
ΔSales for 600
↓CM by 10 (38 Variable - 48 variable) = -10
First:
We have 600 more of sale at this new CM
ΔSales for 600 x Contribution Margin per unit 142 = Δ85,200
Second :
Our other units will have a decrease in their contribution
1,400 x ↓CM (-10) = ↓-14,000
Net 71,200
The opearing income will increase by 71,200