The textbooks produced by a publisher have pages that are 0.1 millimeter thick and a front cover and a back cover that each are 1 millimeter thick. Which of the following gives the total thickness \(f(n)\), in millimeters, of a closed book that has \(n\) pages?

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The thickness of the cover and back cover are fixed, but the thickness is increased for every page.

$$ f(n)= \underbrace{1}_\text{front cover} + \underbrace{1}_\text{back cover} + \underbrace{0.1(n)}_\text{0.1 mm per page} $$ $$ \boxed{f(n)= 2+0.1n }$$