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As a piece of homework,I found this advanced software"Personal Inflation Calculator"
A poor person,such as me...here is the result.We can see the differences..
My personal inflation :1%
Official inflation :1.6%
Which means Official inflation is more than my personal inflation
LET`S see median income people(my host mother)
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And finally upper income people(BECKHAM)
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The difference is 0.3%,it`s acceptable number...