In 1978, the CPI for Canada was 43.6, but in 1988,the CPI was 84.8. What was the geometric mean annual increase for the period?

In 1978, the CPI for Canada was 43.6, but in 1988, the CPI was 84.8. What was the geometric mean annual increase for the period?
Solution:
N = number of years
N = 1988 – 1978 = 10
CPI1988 = CPI1978 (1 + x) N
84.8 = 43.6 (1 + x) 10
(1 + x) 10 = 84.8/43.6
(1 + x) 10 = 1.9449541
1 + x =...