The Bornean orangutan is listed as Endangered and numbers approximately 41,000, while the Sumatran orangutan is considered Critically Endangered with an estimated population of 7,500. A century ago, more than 230,000 orangutans likely roamed in the wild.
Making the world better, one answer at a time. If you go to the United States Postal Service web-stie, you will find that one US First class stamp ($0.42) will cover the cost to mail a letter that weighs up to 1 ounce, about 28.35 grams. Thus, the average weight of a letter is one ounce or less. If you go to the United States Postal Service web-stie, you will find that one US First class stamp ($0.42) will cover the cost to mail a letter that weighs up to 1 ounce, about 28.35 grams.  Minor edit?
However, a standard size envelope weighing 1 ounce or less requires a 49-cent stamp. On the other hand, if your letter weighs over 1 ounce, you need to stick an extra 21-cent stamp for every additional ounce. Say for instance, if you have one 7-cent Franklin stamp and five 4-cent Lincoln stamps, then you have stamps worth 27 cents. 2  Now, subtract the total number of stamps from the total sum you require to mail the envelope. 3  Say for example, your letter weighs 2 ounces, then you require 61 cents = 17 + 44.