calculate and analyze depreciation under alternative methods

On January 1, 2010, the super fast subs company purchased a delivery automobile for $31,000.  The estimated useful life of the vehicle is five years, and the estimated salvage value is 1,000. The company expects the automobile to be driven 200,000 miles during its service life. Actual miles driven were:

Year    Miles

2010   35,000

2011   40,000

2012   45,000

2013   39,000

2014   41,000

Requirements

1. Calculate the depreciation expense for each year of the five-year-life of the automobile using the following methods. (Round your answers to the nearest dollar.)

a, Straight-line method

b. Double-declining balance method

c. Activity method

2. How does the choice of depreciation methods affect net income in each of the years? How does the choice of depreciation methods affect the balance sheet in each of the years?