Keating Co. is considering disposing of equipment with a cost of $58,000 and accumulated depreciation of $40,600. Keating Co. can sell the equipment through a broker for $33,000, less a 8% broker commission. Alternatively, Gunner Co. has offered to lease the equipment for five years for a total of $46,000. Keating will incur repair, insurance, and property tax expenses estimated at $9,000 over the five-year period. At lease-end, the equipment is expected to have no residual value. The net differential income from the lease alternative is a. $4,648 b. $9,960 c. $7,968 d. $6,640