On March 1, 2000, Barnes Company purchased equipment at a cost of $50,000. The equipment was estimated to have a salvage value of $5,000 and it is being depreciated over eight years under the sum-of-the-years'-digits method. Barnes is a calendar-year company. What should be the charge for depreciation of this equipment for the year ended December 31, 2002?

a. $8333.3

b. $10000

c.$8958.4

d. 7708.3

I KNOW THE ANSWER IS D..PLEASE HELP EXPLAIN THE SOLUTION