# 4. In a stack there are 5 books each of thickness 20mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack.

the thickness of each book = 20mm

So, the thickness of 5 books = $(5\times 20)=100 mm$

the thickness of one paper sheet =0.016mm

So, the thickness of 5 paper sheet =  $(5\times 0.016)=0.08 mm$

the total thickness of the stack = (100+0.08)mm

=100.08 mm or

$(1.008\times10^{-2}mm)$

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