The initial cost of a packed-bed degassing reactor for removing trihalomethanes from potable water is $84,000. The annual operating cost for power, site maintenance, etc. is $13,000. If the salvage value of the pumps, blowers, and control systems is expected to be $9000 at the end of 10 years, the AW of the packed-bed reactor, at an interest rate of 8% per year, is closest to:
(a) $?26,140
(b) $?25,518
(c) $?24,900
(d) $?13,140
AW = -84,000(A/P,8%,10) – 13,000 + 9000(A/F,8%,10)
= -84,000(0.14903) – 13,000 + 9000(0.06903)
= $-24,897
Answer is (c) $?24,900
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