The Flynn Corporation began operations on September 1, 20x3. On that date, equipment costing $84,000 was purchased. Flynn estimated that the equipments useful life would be seven years and have a residual value of $24,500. Flynn also estimated that the equipment could be used for about 10,000 hours. It was used for 800 hours in 20x3 and 1,700 hours in 20x4. Required Calculate depreciation expense for 20x3 and 20x4 under each of the following methods: a) Straight-line method. b) Units of production method c) Diminishing balance method at a rate of 30%. Calculate depreciation expense in 20x7 also.