Page numbering

The book has 88 pages. How many times is the number 4 used for the book numbering?

Correct answer:

n =  19

Step-by-step explanation:

1c:  4 X4:  14,24,34,44,54,64,74,84 4X:  40,41,42,43,44  ,45,46,47,48,49  n=1+9+9=19

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