On January 2 2017, Motors Inc. purchased an engine with a cost of $35,000. At the time, it was expected to last 5 years, with a residual valuevalue of $2000. Three years later, on January 2, 2020 a new part was added to the engine, to increase its productivity. The new part has a cost of $10,000. Motors Inc. revised theit estimates to extend the expected useful life of the engine to 7 years, and the estimated residual value to $3,000. The revised amortization expense staring January 2020, would be: O A. $15,200 OB. $19,800 OC. $5,550 OD. $6,600