Assume you have created a word document with one inch...

Assume you have created a Word document with one inch margins. You open the document at a later time and change the margins to 1.5 inches. What can you say about the number of hard and soft returns before and after the change in margins? Select one: a. The number of soft returns is the same, the number of hard returns has decreased b. The number of hard returns is the same, the number of soft returns has decreased c. The number of hard returns is the same, the number of soft returns has increased d. The number of both hard and soft returns is unchanged e. The number of soft returns is the same, the number of hard returns has increased

Transcript

00:01 In this question, they say that a photocopy machine can reduce copies to 80 % of their original size.

00:07 By copying an already reduced copy, further reductions can be made.

00:14 In part a, we say, if a page is reduced to 80%, what percent enlargement is needed to return it to its original size? note that on a photocopy machine, the percent enlargement gives the multiple of the new image of the original.

00:34 So, 120 % enlargement means the new image is 20 % larger than the original.

00:44 So it must be enlarged to what percent of its reduced size? so we first, it was reduced to 80%.

00:56 Now what i want to do is i want to convert that into a fraction.

01:01 I want to say 80 % is 80 over 100, which simplifies to 4 fifths.

01:11 And so now, what does the enlargement have to look like? well, for the enlargement, we need the reciprocal of the reduction.

01:20 The reduction was to 4 fifths of the original size, so the enlargement has to be to 5 fourths of the original size.

01:30 Now, 5 fourths is 1 .25 as a decimal.

01:37 And so if i convert that into a percent, i am going to get 125%.

01:43 So, 125 % enlargement, 25 % larger than the reduced size, brings me back to the original size.

01:53 And then in part b, we say, estimate the number of times in succession that a page must be copied to make the final copy less than 40 % of the size of the original.

02:05 So, the idea is, if i reduce once, we reduce to 80 % of the original.

02:15 If i reduce twice, well, i'm going to look at 0 .8 squared...

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