Maintenance costs for a regenerative thermal oxidizer increased according to an arithmetic gradient for 5 years. The cost in year 1 was $7000. If the interest rate is 10% per year and the present worth of the costs for a 5-year period was $28,800, the amount of the yearly increase, G, was closest to:
(a) $1670
(b) $945
(c) $620
(d) $330
28,800 = 7000(P/A,10%,5) + G(P/G,10%,5)
28,800 = 7000(3.7908) + G(6.8618)
G = $330
Answer is (d)
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