For the declining-balance method, the company uses the double-declining rate. For the units-of-activity method, total miles are expected to be 120,000. Actual miles of use in the first 3 years were 2013, 24,000; 2014, 34,000; and 2015, 30,000. Compute the amount of accumulated depreciation on each bus at December 31, 2014. If Bus 2 was purchased on April 1 instead of January 1, what is the depreciation expense for this bus in (1) 2012 and (2) 2013