Consider the following information about a newly purchased non-current asset: Purchase price = OMR. 800 = annual Dep Cosh - Residual value useful life Residual value = OMR. 50 = Useful life = 4 years Total production capacity = 100,000 units Diminishing balance method = 50% per annum Production in year 1 and 2 = 20,000 units each year Production in year 3 and 4 = 30,000 units each year = Calculate the depreciation charge for each of the 4 years under straight line method, diminishing balance method, and units of production method