Products A, B, and C are produced from a single raw material input. The raw material costs 90,000, from which 5,000 units of A, 10,000 units of B, and 15,000 units of C can be produced each period. Product A can be sold at the split-off point for 2 per unit, or it can be processed further at a cost of 12,500 and then sold for 5 per unit. What is the per unit change in income if Product A is processed further?