Twenty-one pounds of pennies are roughly $38. A new US penny weighs 2.5 grams, there are 453.5 grams in a pound, therefore there are approximately 181 pennies in a pound, and using this there are 3809 pennies in 21 pounds.
Three thousand eight hundred nine pennies equal $38.09.
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4368 and its multiples.
21 pennies
17.5% of 21 pounds = 17.5% * 21 = 0.175 * 21 = 3.675 pounds
You could have: 8 nickels and 1 penny or 6 nickels and 11 pennies or 4 nickels and 21 pennies or 2 nickels and 31 pennies. The option of 0 nickels and 41 pennies is excluded by the necessity that the amount is made up of dimes, nickels and pennies; 0 nickels would mean the $1.21 was made up of dimes and pennies only.
21% of 41 pounds= 21% * 41= 0.21 * 41= 8.61 pounds