A nickel is 5 cents so there are 20 in a dollar (100/5 = 20). Then $90 = 90*20 = 1800 coins.
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90 dollars. There are 20 nickels in a dollar so 1800 nickels = 1800/20 dollars
There are 40 nickels in 2 dollars.
2000 nickels
There are 100 nickels in 5 dollars.
500 dollars = 10,000 nickels