Sanders Rental Company (SRC) paid cash to purchase an automobile on January 1, 20X4. The car dealer gave SRC a $1,000 cash discount off the $19,000 list price. SRC then paid an additional $2,000 to equip the car with a more luxurious interior so it would have greater appeal to its clientele. SRC expected the car to have a four-year useful life and a $4,000 salvage value. SRC expected to lease the car for 100,000 miles before disposing of it. Finally, SRC leased the car to a customer who drove it 30,000 / 10,000 / 40,000 / 25,000 miles during 20X4, 20X5, 20X6, and 20X7, respectively. Required:
Compute the annual depreciation expense for the automobile for years 2010 through 2013 by completing the format provided and the following depreciation methods.

a. Straight-line
b. Double-declining balance
c. Units of production