The thickness of an 800 pages of book is 18mm. Calculate the thickness of one leaf of the book giving your answer in meters and in standard form

A.
2.25 x 10^{4}m 
B.
50 x 10^{4}m 
C.
2.25 x 10^{5}m 
D.
4.50 x 10^{5}m
Correct Answer: Option C
Explanation
Thickness of an 800 pages book = 18mm to meter
18 x 10^{3}m = 1.8 x 10^{2}m
One leaf = (frac{1.8 times 10^{2}}{800})
= (frac{1.8 times 10^{2}}{8 times 10^{2}})
= (frac{1.8}{8}) x 10^{4}
= 0.225 x 10^{4}
= 2.25 x 10^{5}m