On January 1, 2013, Plymouth Corporation acquired 80 percent of the outstanding voting stock of Sander Company in exchange for $1,200,000 cash. At that time, although Sander's book value was $925,000, Plymouth assessed Sander's total business fair value at $1,500,000. Since that time, Sander has neither issued nor reacquired any shares of its own stock. The book values of Sander's individual assets and liabilities approximated their acquisition date fair values except for the patent account, which was undervalued by $350,000. The undervalued patents had a 5- year remaining life at the acquisition date. Any remaining excess fair value was attributed to goodwill. No goodwill impairments have occurred. Sander regularly sells inventory to Plymouth. Below are details of the intra-entity Intra-Entity Gross Profit Rate Intra-Entity Ending Inventory on Intra-Entity Year 2013 2014 2015 Sales at Transfer Pricelnventory Transfers 125,000 220,000 300,000 80,000 125,000 160,000 25% 28% 25%