On January 1, 2018, Notsuch Corporation sold specialized equipment originally costing $ 20,000 and having a book value of $ 16,000. The market value of the equipment was not readily determinable. Notsuch received a $ 5,000 down payment and a $ 10,000 note payable in four years. The current market rate (effective rate) on notes of a similar nature and risk is 10 percent. Prepare the entries to record the sale of the equipment on January 1, 2018 and the recognition of interest revenue for 2019 and 2020.