On January 2, Manning Co. purchases and installs a new machine costing $324,000 with a five-year life and an estimated $30,000 salvage value. Management estimates the machine will produce 1,470,000 units of product during its life. Actual production of units is as follows: year 1, 355,600; year 2, 320,400: year 3, 317,000; year 4, 343,600; and year 5, 138,500. The total number of units produced by the end of year 5 exceeds the original estimate -this difference was not predicted. (The machine must not be depreciated below its estimated salvage value.)