The Consumer Price Index (CPI) is a measure of inflation obtained by comparing current prices with base prices. The inflation rate equals the percent of change in the CPI over that period. (a) Calculate the inflation rate from 2005 to 2020. (b) If a pair of sneakers cost $82 in 2005, use the inflation rate from part (a) to estimate the cost of the sneakers in 2020. A bar graph titled "Consumer Price Index" with vertical axis labeled from 0 to 300 in increments of 50 and horizontal axis labeled Year from 2005 to 2020 in increments of 5 contains vertical bars with labeled heights as follows: 2005, 187; 2010, 217; 2015, 237; 2020, 255. Consumer Price Index 2005 2010 2015 2020 0 50 100 150 200 250 300 187 217 237 255 Year Question content area bottom Part 1 a. The inflation rate from 2005 to 2020 is