The Eimac tubes in a linear amplifier for radio transmission are estimated to provide 18,000 hours of operation before requiring replacement. A pair of tubes costs $20,000 and has no salvage value. Their use, expressed in hours over a 4-year period, is (1) 2,500, (2) 4,500, (3) 3,000, and (4) 3,900. Determine the current book value based upon the operating hour method of depreciation.

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D = (P-F)(Q,/Q) (9.B.2)