At the beginning of Year 1, Copeland Drugstore purchased a new computer system for $52,000. It is expected to have a five-year life and a $7,000 salvage value.

Required

Compute the depreciation for each of the five years, assuming that the company uses

(1) Straight-line depreciation. = $9,000

(2) Double-declining-balance depreciation.

(I just don't understand how to find year 4)

Year 1 = $20,800

Year 2 = $12,480

Year 3 = $7,488

Year 4 = ?

Year 5 = $0