What mathematical error can be found in the first paragraph of o Henry's gift of the magi?

The combination of coins DELLa has is logically impossible. The story states that DELLa has $1.87 and that 60 cents of it was in pennies. Subtracting 60 cents from $1.87 leaves $1.27. Since only other coins are nickels, dimes, quarters, half-dollars and dollars and since there are only 60 pennies, the remaining $1.27 must be made up of the other coins. There is no combination of nickels, dimes, quarters, half-dollars and dollars that equals $1.27.