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A stack containing 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?

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100.80 × 102 m m

10.008 × 102 m m

1.0008 × 102 m m

1000.8 × 102 m m

answer is C.

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Detailed Solution

Given data,
Thickness of 1 book = 20 mm.
Thickness of 1 paper sheet = 0.016 mm.
Thickness of all 5 books will be,

⇒ 5 × 20 mm ⇒ 100 mm

Thickness of all 5 paper sheets will be,

⇒ 5 × 0.016 mm ⇒ 0.08 mm

Therefore, total thickness of stack is given by summation of above two thickness.

⇒ 100 mm + 0.08 mm ⇒ 100.08 mm

In standard form,

100.08 mm = 1.0008 × 102 mm

Hence, option 3 is correct.

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