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- Both Delta Air Lines and Singapore Airlines use straight line method of depreciation. The formula for calculating annual straight line depreciation is
Asset value-Residual valueLife of asset (in years)
In our case we start with the asset value of $ 100 for all cases.
- For Delta Air Lines, we have three cases –
Prior to July 1, 1986, the residual value was 10% of asset value and asset life was 10 years. Hence, annual depreciation was 100 – 1010 = $9.
After April 1, 1993, the residual value was 5% of asset value and asset life was 20 ...