In a stack there are 5 books each of thickness $20\;mm$ and 5 papers sheet each of thickness $0.016 \;mm$. What is the total thickness of the stack

Question

$\begin{array}{1 1} 1.008 \times 10^2\;mm \\ 10.08 \;mm \\ 100\;mm \\1.0008\;mm \end{array} $

Comments

You say that last 100.080. But my doubt is how 10 square is comes and how 100.080 becomes 1.0008 . Please answer clearly. You directly copy tge sum in the internet or any guide. Dont have you a brain. ..