Lawn and Trees Company purchased a new aerial tree trimmer at $91,000 and paid $1,800 for its shipping and $1,500 for its assembly and initial training. If the salvage value at the end of 10 years is $21,000, calculate the following: Depreciation in the 4th year and book value at the end of the 6th year using the following methods: (a) sum of the years Depreciation (4th year): Book Value (end of 6th year): (b) double declining balance Depreciation (4th year): Book Value (end of 6th year): (c) straight line Depreciation (4th year): Book Value (end of 6th year): Round off your answers to the nearest 2 decimal places