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?
Â· just now. Report Abuse. Assuming you're sending just a letter of standard size, an ounce in weight, by First Class Mail, then the postage to Singapore is US$0.94. If it's in a large flat envelope, then it's US$1.20 for an ounce in weight. It doesn't go up to more than a few dollars if it's only a letter. just now. Report Abuse. Assuming you're sending just a letter of standard size, an ounce in weight, by First Class Mail, then the postage to Singapore is US$0.94. If it's in a large flat envelope, then it's US$1.20 for an ounce in weight. It doesn't go up to more than a few dollars if it's only a letter.