On January 1, 2006, Forbes Company purchased equipment at a cost of $100,000. The equipment was estimated to have a salvage value of $10,000 and it is being depreciated over eight years under the sum-of-the-years'-digits method. What should be the charge for depreciation of this equipment for the year ended December 31, 2013?

A) 2,500

B) 2,778

C) 5,000

D) 11,250