4. In a stack there are 5 books each of thickness 40mm and 10 paper sheets each of thickness
0.032mm. What is the total thickness of the stack?
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Total number of books in the stack=5
thickness =20mm
Total thickness of the book =20×5=100
Total number of paper =5
thickness of the paper =0.016mm
Total thickness of the paper =5×0.016=0.080
Total thickness of the stack =100+0.080=100.080=1.0008×10
2
mm
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