Simple accounting question. help please?

• sr22 insurance cost
• book deposit

A three-year-old machine that has a cost of $23,200, has an estimated residual value of $1,600 and an estimated useful life of 36,000 machine hours. The company uses units-of-production depreciation and ran the machine 5,100 hours in year 1; 7,850 hours in year 2; and 6,900 hours in year 3.


I got $9,690, but it is not the right answer. why?

Here is my work: (23200-1600)/36000=.6

.6*5100=3060

.6*7850=4710

.6*6900=4140


Then i used (23200-1600)-(3060+4710+4140)=9690.

Simple accounting question. help please?