What is the perfect amount of coins to keep in your wallet to make 99 cents?
I want to know how many coins to keep in my wallet to make perfect change whenever i buy something.
I think the question is
What is the minimal set of coins that can make ANY amount from 1c to 99c ?
4 x 1c takes care of 0-4c
1 x 5c takes care of 5-9c (with the pennies)
1 x 10c takes care of 10-19c
Then you need another nickel or dime to cover 20-24c.
We now have 0-24c.
Then adding a quarter to these takes care 25-49c
and adding a half-dollar takes care of 50-99c.
4 pennies
1 nickel
1 dime
1 quarter
1 half-dollar + (1 nickel or 1 dime)
9 coins.
.
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