In 1983, a can of house paint cost $16.35. in 2000, a can of house paint cost $28.94, and in 2005, a can of house paint cost $32.54. what is the difference in cpi between 2000 and 2005?

The Consumer Price Index is calculated through the equation,
                             CPI = (current period price/base period price) x 100
The base period is 1983. Solving the CPIs for 2000 and 2005
         (2000) 
                             CPI = ($28.94/$16.35) x 100 = 177
        (2005)           
                             CPI = ($32.54/$16.35) x 100 = 199
The difference between the CPIs of 2005 and 2000 is 199 - 177 = 22.