Let the dimensions of the cuboid container be x,y and z
Thus, volume of cuboid is xyz
According to the question, in a cuboid of volume xyz, 100 boxes can fit.
Now the increased dimensions of the container when doubled = 2x, 2y and 2z
Thus, volume of larger container = 2x * 2y * 2z
So, we find that when the dimensions of the container is doubled, the volume increases 8 times. Therefore the number of boxes it can hold will also increase to 8 times
Thus, no. of boxes it can hold = 100 x 8
= 800 boxes
Hope that helps !!