Alright, lets get started.
Height of the bin = 4 ft
Length of the bin = 9 ft
Width of the bin = 11 ft
Volume of the bin =

Volume V

Volume V
cubic feet
6 books fiils 1 cubic feet
or
1 cubic feet is filled by = 6 books
So, 396 cubic feet is filles by

So, 396 cubic feet is filles by
books
It means 2376 books will fit in the storage bin. : Answer
Hope it will help :)