A book has a front and back and 400 pages . the front cover are 0.9mm thick, measured to 1 decimal place.
each page is 0.13 mm thick, measured to 2 decimal places .
calculate the minimum thickness of the book.

The minimum thickness of the book would simply be the sum of the thickness of the two cover pages and all the pages in between. That is:

minimum thickness = 0.9 mm * 2 + 0.13 mm * 400

minimum thickness = 53.8 mm

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