On December​ 31, Year​ 1, Brown Brothers purchased machine A for​ $770,000 and machine B for​ $300,000. The machines are depreciated on the​ straight-line basis over 10 years with no salvage value. Brown reviews its assets for impairment annually. While doing the U.S. GAAP impairment analysis at​ year-end of Year​ 6, Brown determines that the expected future cash flows are​ $70,000 per year from machine A and​ $40,000 per year from machine B over the remaining lives of the assets. At December​ 31, Year​ 6, the fair values of machines A and B are​ $300,000 and​ $180,000, respectively. What amount of impairment loss should Brown report on its Year 6 income statement under U.S.​ GAAP
a) $0
b) $50,000
c) $90,000
d) $130,000