Answer
$g$.
Work Step by Step
Since the letters are sheets of papers which are light, the appropriate measuring unit is a gram or $g$. That is, postage rates for letters are based on the number of grams or $g$.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 3 - Section 3.3 - Mass and Weight - Exercise - Page 144: 29
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