At the beginning of 2016, Robotics Inc. acquired a manufacturing facility for $12 million. $9 million of purchase price was allocated to the building. Depreciation for 2016 and 2017 was calculated using the straight-line method, a 25-year useful life, and $1 million residual value. In 2018, the estimated useful life and residual value were changed to 20 years and $500,000, respectively. What is depreciation on the building for 2018?

A) $463,667

B) $436,667

C) $643,667

D) $636,667