Harley Company produces furniture from a joint process. Joint costs are \$10,000 for processing 1,000 square feet of lumber. If Harley sells the lumber at split-off they receive revenue of \$15 a square foot. If they process the 1,000 square feet of lumber further into furniture, additional processing costs are \$5 a square foot and the final selling price is \$25 a square foot.
What is the relevant increase or decrease in net operating income from processing the wood into furniture?