On January 1, 2016, Dunwoody Instruments sold a depreciable asset for cash of $400,000, and recognized a gain of $60,000. The asset had been purchased on January 1, 2011 with an estimated useful life of 10 years, and no salvage value. The asset was depreciated using the straight-line method. What must have been the original cost of the asset?

A) $660,000

B) $800,000

C) $680,000

D) $920,000