6. What is the fourth year depreciation expense under sum-of-years digits? A. $2,400 B. $1,000 C. $1,100 D. $1,200 7. Assume the asset produced 13,000 units. What is the depreciation expense under the units of production method? A. $1,300 B. $2,500 C. $3,250 D. $4,250 8. Assume the declining-balance = 200% method is used. What is the book value at the end of year 2? A. $6,000 B. $3,600 C. $2,160 D. $1,296