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Oh, dude, you're hitting me with some math here. So, let's see, you've got 50 cents, 2 dollars, and 1 dollar coins. Well, technically, you could make up 10 dollars with 20 of those 50 cent coins, or 5 of the 2 dollar coins, or 10 of the 1 dollar coins. So, like, there are a few ways you could do it, but who's really counting, right?
3 dimes 13 nickles 5 pennies
$10 50c
More information is needed. Please post a new and separate question with the coin's country of origin. Many countries have 50¢ coins.
$490 20*.50=$10 500-10=$490