Suppose that the following table shows the average retail price of butter (the price of salted, grade AA butter per pound) and the Consumer Price Index (CPI) from 1980 to 2010, scaled so that the CPI = 100 in 1980.
1980 
1990 
2000 
2010 

CPI 
100.00100.00 
158.56158.56 
208.98208.98 
218.06218.06 
Retail price of butter 
1.961.96 
1.861.86 
2.352.35 
2.992.99 
Calculate the real price of butter in 1980 dollars. (Enter your responses rounded to two decimal places in the table below.)
1980 
1990 
2000 
2010 

Real price of butter 
nothing 
nothing 
nothing 
nothing 
Real price of butter in year 1980 = [CPI 1980 / CPI 1980 ]* nominal price of butter in year 1980
= [100/100]*1.96
= $1.96
Real price of butter in year 1990 = [CPI 1980 / CPI 1990 ]* nominal price of butter in year 1990
= [100/ 158.56]*1.86
= $1.17
Real price of butter in year 2000 = [CPI 1980 / CPI 2000 ]* nominal price of butter in year 2000
= [100/ 208.98]*2.35
= $1.12
Real price of butter in year 2010 = [CPI 1980 / CPI 2010 ]* nominal price of butter in year 2010
= [100/ 218.06]*2.99
= $1.37
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