Sheffield Corp, has the following costs when producing 100000 units: An outside supplier is interested in producing the item for Sheffeld. If the item is produced outside, Sheffield could use the released production facilities to make another item that would generate $240000 of net income. At what unit price would Sheffield accept the outside supplier's offer if Sheffield wanted to increase net income by $200000 ? $10.40$8.40$6.40$5.60