Holden Corp. purchased an office building on January 13, 2003 for $600,000. At the time, it was estimated that the building would last for 25 years and would have a residual value of $138,000. On January 8, 2008, a significant modification was made to the roof of the building at a cost of $42,228. This modification could not be identified as a separate component, but it was believed that it would add an additional 8 years to the useful life. As well, it was estimated the residual value would be reduced to $97,600, at the end of the revised useful life. In 2015, due to a collapse in the local property market, the residual value was revised to $0. The useful life, however, was expected to remain as estimated on January 8, 2008. The company uses the straight-line method of depreciation and is calculated to the nearest month. Please make sure your final answer(s) are accurate to the nearest whole number. a) Calculate the annual depreciation that was charged from 2003 to 2007.

b) Calculate the annual depreciation that was charged from 2008 to 2014.

c) Calculate the annual depreciation that will be charged from 2015 onwards.