4 dollars and 20 cents. Don't even think about store accepting 4 dollars as the rounded value!
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You can buy 20 x 20cent lollies with 4 dollars.
$4. A nickel is 5 cents, so $1 is 100 cents / 5 cents = 20 coins. Finally, 80/20 = 4.
A nickel is worth 5 cents. If by "20" you mean 20 cents, you need 20 / 5 = 4 nickels. If you mean 20 dollars, a dollar is 100 cents so $20 = 2000 cents, and you'd need 2000 / 5 = 400 nickels.
20% off $4.50 = $4.50 - (0.20 x $4.50) = $3.60
Ten percent of 48 dollars and ten cents is 4 dollars and 81 cents.