In what way does the document use an example to the reader better
understand the subject matter?
a. by prompting readers to fill out a checklist of preparations for their
own literary magazine
o
b. by calculating how much students may pay for copies based on
their magazine's audience size
o
c. by showing the layout of a sample magazine page
o
d. by indicating how pages in a print magazine can be bound

B). By calculating how much students may pay for copies based on  their magazine's audience size.

Explanation:

The examples or illustrations always assist the authors to demonstrate their point more clearly and comprehensively before the audience that would assist them to understand.

As per the question, option B displays the manner in which examples assist the reader better understand the subject matter. 'The calculation of the no. of  estimated students who may pay for the copies based on magazine's audience' would provide the reader with the essential information to accomplish their understanding of the topic. Thus, option B is the correct answer.

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