Two 37 cent stamps (assuming that the letter doesn't weigh more than an ounce). But as you only need to put one 41-cent stamp on the letter, you could go buy some 2-cent stamps and save yourself some money.
2 stamps. ! stamp is good for up to one ounce, 21 cents for second ounce.
if it weighs an ounce or less, three stamps.
4
First class postage was 37 cents for the first ounce in 2005. A post card cost 23 cents.
Yes, you can mail a 2 ounce letter with that much postage and be paying more than you should.
One, plus a 21-cent extra-ounce stamp.
Depends where it's going to
It depends what country and how far you are sending it.
Currently in the US up to one ounce is 45 cents. So however many stamps it takes to make that amount.
One forever stamps pays for up to a one ounce letter. BTW, I think .06 oz. is impossibly light. Maybe you meant .6 or something else.
The first ounce will cost 44 cents. Each additional ounce, or fraction of an ounce, is 17 cents. The total will be 95 cents for a 3.4 ounce letter.