Enter the math

There are several mathematical issues we must address: first, the calculation of the percentage needed to get from the original size to the reproduction size. This is simple long division (use a calculator):

What you want
What you have

For example: you want to reproduce an image 9 inches wide, and the original is 2.25 inches wide. You divide 2.25 by 9, resulting in the quotient: 4. That is a whole number which will come into our next equation, how much resolution do you need?

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