One C4 weighs about 1 and a half pounds in call of duty.
The amount of stamps needed for an envelope is determined by weight. Weigh your a4 envelope and you will know how much postage is needed.
area of envelope = l Xb =8.5 X11 =93.5 inch^2
The cost to mail a manila envelope will depend on the size of the envelope and the weight of the envelope. The average cost to mail a manila envelope that is 8"X11" is about $2 if the contents weigh less than one pound.
A scale
It depends on how much they weigh. You can check with the carrier how much it will cost once you know how heavy they are.
As long as the envelope doesn't weigh too much (If you're just mailing paper, then it probably doesn't) then no it doesn't cost more.
Postage depends on which country you live in, how much the envelope and contents weigh, and where you are sending the envelope to. You'll need to include all that in your question to get the correct answer - or you could just go to your local postal website and get the answer from the experts...
postage needed for A09 envelope
A 6x8 envelope matches the requirements for a regular 46 cent stamp, as long as it doesn't weigh more than 1 oz. This is according to everything I can find for myself online right now, but I haven't actually done it yet.
That depends, but.... A standard #10 envelope 4.5″ x 9.75″ weighs .238 oz or 6.75 grams. 6.75 * 2 = 13.5 g 0.238 * 2 = 0.476 oz 2 standard envelopes weigh approximately 13.5 grams or 0.476 ounces.
how much postage required for a 9x12 envelope weighing 4.6 ounces