It would depend on the type of paper as well as the thickness. For example, wood pulp paper would weigh much more than rice paper.
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Yes, it is the same for the same weight. Both are considered 'oversized' mail or 'flats' and cost more than a normal business envelope. the current rate would be 88 cents for the first ounce and 17 cents for each additional ounce.
9,18,27,36,45,54,63,72,81,90,99108
3 x 12 x 9 = 324 39 x 12 = 468
9x = 144 Therefore, 144/9 = x Therefore, x = 16
Multiply each dimension by the scale factor:9 x 12 → (9 x 2.5) x (12 x 2.5) = 22.5 x 30