The XYZ Block Company purchased a new office computer and other depreciable computer hardware for $12,000. During the third year, the computer is declared obsolete and is donated to the local community college. Using an interest rate of 10%, calculate the PW of the depreciation deductions. Assume that no salvage value was initially declared and that the machine was expected to last 5 years. (Use Sum-Of-Years'-Digits to calculate)