A building was acquired at the beginning of the year at a cost of $980,000. It has an estimated residual value of $60,000 and an estimated useful life of 20 years. Answer the following questions (keep 2 decimals): Using straight-line method to determine 1) to 7): 1) the depreciable cost 2) the monthly depreciation expense 3) the annual depreciation expense 4) the net book value at the end of useful life st 5) the accumulated depreciation expense at the end of 1 year 6) the depreciation expense of 11 year th 7) the accumulated depreciation expense at the end of 12 year Using sum-of-years digit method to determine 8) to 15): 8) the sum-of-years digit to be used 9) the depreciable cost 10) the depreciation expense of the 1st year th 11) the accumulated depreciation expense at the end of 5 year 12) the net book value at the end of useful life 13) the proportions to be lost duringh 18 year 14) the depreciation expense of 10 year th 15) the accumulated depreciation expense at the end of 20 year