On January 1, 2018, Tamarisk Ltd. purchased equipment for $856,000. The equipment was assumed to have an 8-year useful life and no residual value, and was to be depreciated using the straight- line method. On January 1, 2020, Tamarisk's management became concerned that the equipment may have become obsolete. Management calculated that the undiscounted future net cash flows from the equipment was $615,250, the discounted future net cash flows was $545,700, and the current fair value of the equipment (after costs to sell) was $535,000. Assuming that Tamarisk is a private Canadian company following ASPE, identify which model should be used to test for impairment should be used to test for impairment