Answer:
Differential income = $960
Step-by-step explanation:
In a special order decision , the offer should be accepted if the sales revenue from the order is greater than the relevant costs of the special orders.
The relevant costs of the special order = variable cost + additional cost of special stitching machine
$
Sales revenue (120× $18) 2,160
The relevant costs of the special order
= (120×8) + (120×2) (1,200)
Differential income 960