For metal, calculate the average rate of change between 1980 and 1988. Then interpret what this value means. a. From 1980 to 1988, the number of pounds of metal per person per day decreased by 0.00125 per year. c. From 1980 to 1988, the number of pounds of metal per person per day decreased by 0.125 per year. b. From 1980 to 1988, the number of pounds of metal per person per day decreased by 0.071 per year. d. From 1980 to 1988, the number of pounds of metal per person per day increased by 0.01 per year.