Answer:
8.43%
Explanation:
The computation of combined margin is shown below:-
For computing the combined margin for the entire company first we need to compute the combined net operating income and combined sales which is here below:-
Combined net operating income = Existing operating income + Operating income from new investment opportunity
= $864,000 + ($4,200,000 × 30% - $960,000)
= $864,000 + ($1,260,000 - $960,000)
= $864,000 + $300,000
= $1,164,000
Combined sales = $9,600,000 + $4,200,000
= $13,800,000
Combined margin for entire company = Combined net operating income ÷ Combined sales
= $1,164,000 ÷ $13,800,000
= 8.43%