(Supplement) Thornton Industries purchased a machine for $45 ,()()() and is depreciating it with the straight-line method over a life of 10 years, using a residual value of $3,000. At the beginning of the sixth year, a major overhaul was made costing $5,000, and the total estimated useful life was extended to 13 years. Depreciation expense for year 6 is:

a. $1,885.

d. $3,625.

b. $2,000.

e. $4,200.

c. $3,250.

(Appendix)