Economics (inflation)
posted by Lisa .
Hello! Could someone please check my answers for the first 2 problems and help me out with the 3rd? Thanks!
1. If the CPI in 1863 was 9 and the CPI in 2000 was 171.9, how much has inflation increased (%) since 1863?
I used the inflation rate equation and got a 1898.89% increase as my answer.
2. If a new loaded Mustang in 1964 (CPI 31.0) cost $2,800, how much should the car cost in 2010 (CPI 218.0) after adjusting for inflation?
I used the "salary in today's currency" equation and got $19,690.32.
3. A new mustang starting price is over 20,000. Has the car kept pace with inflation or exceeded it? Why?
I'm confused by this, please help.

1. (171.9/9) * 100% = 1910 %.
It went from 100% to 1910%.
% Increase = 1910%  100% = 1810%.
OR:
Increase = 171.99 = 162.9.
%Increase = (162.9/9) * 100% = 1810%.
2. Cost = (218/31) * $2800 = $19,690.32
3. 20101964 = 46 years.
$19,690.32/46 yrs. = $428.05 /yr.
Cost = 19,690.32+428.05/yr * 2yrs =
$20,546.42 = Cost of new car(yr 2012).
Yes.