In 1995, Wallet Manufacturing Company constructed a plant for $500,000. In 2005, the following expenditures were made related to the plant: New roof -$20,000, Changing the useful life from 20 to 25 years, Painting - $10,000, Property tax - $25,000. A full year of depreciation has been taken on the plant each year since 1995 using straight-line depreciation. Assume the residual value remains $50,000. What should the basis be for depreciation of the plant in 2005?
a) $275,000
b) $295,000
c) $305,000
d) $330,000