Fuller Company makes frames. A customer wants to place a special order for $600$ frames in green with the company logo painted on the frame, to be priced at $$40$ each. Normally, Fuller would charge $$90$ per frame for this type of order. Fuller figures that wood and glass will cost $$16$ per frame, variable overhead $($machining$,$ electricity$)$ is $$4$ per frame, direct labor is $$12$ per frame, and one setup will be required at $$1,000$ per setup. The set$-$up charge costs are $100\%$ labor. Currently, the workers needed to set up for and make the frames are working at Fuller. Their wages will be paid whether or not the special order is accepted. Fuller's policy is to avoid layoffs to the extent possible.

Refer to Figure $13-1.$ If Fuller accepts the special order, by how much will operating income increase or decrease?

$$14,400$ increase

$$12,000$ decrease

$$12,000$ increase

$$21,600$ increase

There will be no effect on operating income.