Dollar Co. purchased a machine on January 1, 2000, for $2,00,000. The estimated life of machine is 3 years or 30,000 hours with a residual value of $50,000. During the machine's life, machine is used for 5,000 hours in the first year, 10,000 hours in the second year, 10,000 hours in the third year.

Calculate the annual depreciation expense and book value for each year of the machine's life under following methods:-

__ a) Straight line method

__ b) Units of production method

_ c) Declining balance method