If the cost to mail a letter is 43 cents for mail weighing up to one ounce and 24 cents for each additional ounce or fraction of an ounce, find the cost of mailing a letter that weighs 81 grams.
First, we need to convert 81 grams to ounces. Since 1 ounce is approximately equal to 28.35 grams, we can divide 81 grams by 28.35 to get 2.85 ounces.
The cost to mail a letter that weighs up to 1 ounce is 43 cents, so we can expect the cost for 2.85 ounces to be 43 cents plus 24 cents for each additional ounce.
The additional ounces after the first one would be 2.85 - 1 = 1.85. Therefore, the cost for the additional ounces would be 1.85 * 24 = 44.4 cents.
Adding this amount to the initial cost of 43 cents, we get:
43 cents + 44.4 cents = 87.4 cents
Therefore, the cost to mail a letter weighing 81 grams would be 87.4 cents.