Answer:
$22,400
Step-by-step explanation:
The computation of the change in operating income is shown below:
= Contribution margin per unit × number of watches
where,
Contribution margin per unit = Selling price per unit - Variable expense per unit
= $25 - $21
= $4
And, the number of watches are $5,600
So, the change in operating income would be
= $4 × 5,600
= $22,400