The length of the file is stored in bytes, with one character (letter, punctuation, space or number) accounting for one byte and one Chinese character accounting for two bytes, namely 2B. Note that it is not 2KB. So each book is 400000bx2 = 400000mb1kb = 1024 b, which is approximately equal to1024b.

1KB = 1024 b 1MB = 1024 kb

So the formula is 400000/1024 = 390.625 390.625/1024 = 0.3815.

700/0.38 15= 1834.86

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