On January 1, 2011, Barton Sinks Purchased a Metal-Bending Machine

On January 1, 2011, Barton Sinks purchased a metal-bending machine for $4,000,000 with an expected useful life of 10 years with no residual value. The machine is depreciated on a straight-line basis. On January 1, 2016, the
Company overhauled the machine at a cost of $1,000,000. This extended the expected useful life by 3 years? What is depreciation expense on the machine for 2016, still assuming zero residual value?

A) $600,000
B) $525,000
C) $500,000
D) $375,000