How many figures (digits) are required to number a book

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How many figures (digits) are required to number a book containing 200 pages ?

1. 200
2. 600
3. 492
4. 372

Correct Option: C

Number of one digit pages from
1 to 9 = 9
Number of two digit pages from
10 to 99 = 90
Number of three digit pages from
100 to 200 = 101
∴ Total number of required figures
= 9 x 1 + 90 x 2 + 101 x 3 = 492