Verified Answer :

Length of the cereal box = 8 1/2 inches
                                        = 17/2 inches
Width of the cereal box = 3 1/2 inches
                                      = 7/2 inches
Height of the cereal box = 12 inches
Then
Volume of the cereal box = Length Width Height
                                        = (17/2) (7/2) 12 cubic inches
                                        = 17 7 12 cubic inches
                                        = 1428 cubic inches

I think its 357 squared. Just multiply all of it together. I'd check the formula for finding volume if you want a reliable answer