40
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200 grams
1600 grams or 1.6 kilograms
A nickel is 5 cents, and $2 is 200 cents. Thus you need 200/5 = 40 coins.
There are 20 nickels in a dollar. 20 nickels x 200 = 4000
200 dollars has the same value and the same purchasing power, regardless of what combination of coins or paper bills is used to present it. If it is presented all in the form of nickels, then it requires 4,000 nickels.