please help. In recent years Juresic Transportation purchased three used bu

please help.

In recent years Juresic Transportation purchased three used buses. Because of frequent turnover in the accounting department a different
accountant selected the depreciation method for each bus and various methods were selected.

For the declining-balance method the company uses the double-declining rate. For the units-of activity method total miles are expected to be 126400. Actual
miles of use in the first 3 years were: 2010 24300; 2011 35100; and 2012 31500.

Compute the amount of accumulated depreciation on each bus at December 31 2011.

If bus no. 2 was purchased on April 1 instead of January 1 what is the depreciation expense for this bus in (1) 2009 and (2) 2010?