It depends on the denominations of the coins and the exchange rate at the time.
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Two make combinations you would take 2x1=2 combinations only
There are ten dimes in a dollar.
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20
The answer will depend on which country's dollar, and therefore what he coins are. The US has a 25 cent coin but not a 20 cent coin. Australia is the other way around. There is no indication in the question which one you mean - if either. there are many more countries that use a dollar as their main currency unit.