On January 1, 2014, Orton Co. sold a used machine to King, Inc. for $1,050,000. On this date, the machine had a depreciated cost of $735,000. King paid $150,000 cash on January 1, 2014 and signed a $900,000 note bearing interest at 10%. The note was payable in three annual installments of $300,000 plus interest beginning January 1, 2015. Orton appropriately accounted for the sale under the installment-sales method. King made a timely payment of the first installment on January 1, 2015 of $390,000, which included interest of $90,000 to date of payment. At December 31, 2015, Orton has deferred gross profit of a. $210,000. b. $198,000. c. $180,000. d. $153,000.