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22. The ENR Construction Cost Index was 3378.17 in 1980. If the index was 4770.03 in 1990, the annual increase in construction costs over that time period was closest to: A) B) C) 3.51% 4.63% 5.42% 6.88% D) 4770.03-3378.1701 + 010 (1 f)10= 1.4120) 0.0351 or 3.51%