On January 1, 2017, Umm Salal Company purchased equipment for 150,000 QR. The estimated useful life of this equipment is 7 years and the residual value is 10,000 QR. The company uses the straight-line method. During 2020, the remaining useful life was changed to be 6 years, and the residual value was changed to 15,000 QR. Consequently, the depreciation expense for the year 2020 according to the straight-line method will be the following amount: OA. ) 8,334 OB. ) 13,889 Oc. ) 12,500 OD. ) 20,000