Seasons, Inc. has the following plant, property, and equipment assets on its balance sheet for 2021 and 2020: (s thousands) Land Buildings Machinery and equipment Less Accumulated depreciation Total 2021 $ 4,200 10,400 6.500 21,100 7.200 $ 13.900 2020 $ 4,000 9,800 6.800 20,600 6,000 $ 14,600 Depreciation expense for 2021 was $1.400 Assuming zero salvage value and straight-line depreciation for Season's depreciable assets, approximately what is the useful life of Season's depreciable assets (enter as a year rounded to the nearest tenth. e... 5.2 years)