6. The Jefferson Co. purchased a machine on January 1, 201 The machine cost $595,000. It had an estimated life of ten years, or 30,000 units, and an estimated residual value of $40,000. In 2016, Jeffries produced 3,000 units. Required: Compute the depreciation charge for 2016 using each of the following methods:

a.	Double-declining-balance method
b.	Activity method (units of output)
c.	Sum-of-the-years'-digits method
d.	Straight-line method I think I did this right, but want to make sure