In early 2010, to mail a first-class letter in the United States of America it cost 44 cents for the first ounce and 17 cents for each additional ounce or fraction thereof. Find a formula involving the greatest integer function for the cost of mailing a letter in early 2010. Could it possibly have cost $1.81 or $2.65 to mail a first-class letter in the United States of America in early 2010?
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