Solve the problem. The graph shows the average cost of a barrel of crude oil for the years 1981 to 1990 in constant 1996 dollars. Find the approximate average change in price from 1981 to 1990. 1996 $/Barrel 50- 40- 30+ 20+ 10+ 2 1981 1982 1983 1984 1985 1986 1987 1988 1989 Year O About-$44/year O About -$1/year 17 O About-$24/year O About-$4/year + 1989 1990

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