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Last time 10c is considered to be a sufficient amt for spending to many..
Now, $10 is normally spent when we go buy stuff at minimarts

So lets calculate and predict the future's..

When 10c rules ~ 1960s
When $10 rules ~ 2000
The diff between the years is 40years
The diff in cash is 10x

Therefore in the future around 2040,
a normal person should spent $100 when he/she goes to the minimart.

Plausible?