How many digits are required to number a book containing 240 pages? Choose the correct choice from the following choices
A) 756  B) 612  C) 492  D) 372  E) 250

Rationale: 9 pages from 1 to 9 will require 9 digits . 90 pages from 10 to 99 will require 90 * 2 = 180 digits . 240 - ( 90 + 9 ) = 141 pages will require 141 * 3 = 423 digits . the total number of digits is 9 + 180 + 423 = 612 . the answer is b .
Answer: B