15. Sam wanted to know how much the price of milk had changed over the last few decades. He found that the

15.
Sam wanted to know how much the price of milk had changed over the last few decades. He
found that the price of a gallon of milk was $0.80 in 1970 and in 1990 it was $1.20. What
was the average rate of change in a gallon of milk per year?
Do not enter $ in your answer. Make sure to include a negative sign if annlicable


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