If the CPI was 72.6 in 1979 and 144.5 in 1993, by what percentage did prices rise during the period 1979-1999?

99.035%

Explanation:

Data provided in the question:

CPI in 1979 = 72.6

CPI in 1993 = 144.5

Now,

The percentage by which prices rise during the period 1979-1999 will be calculated as:

= [ (CPI in 1993 - CPI in 1979) : CPI in 1979 ] * 100%

or

= [ (144.5 - 72.6) : 72.6 ] * 100%

or

= [ 71.9 : 72.6 ] * 100%

or

= 99.035%

The percentage by which prices rise during the period 1979-1999 is 99.035%