3. A machine originally had an estimated useful life of 5 years, but after 3 complete years, it was decided that the original estimate of useful life should have been 10 years. At that point the remaining cost to be depreciated should be allocated over the remaining: 3. A machine originally had an estimated useful life of 5 years, but after 3 complete years, it was decided that the original estimate of useful life should have been 10 years. At that point the remaining cost to be depreciated should be allocated over the remaining: egu ue Sun