
1) We need to get some measures to this crate so that we can get to know the answer.
2) Consider a crate like a rectangular prism, with the following measures:

So now, let's apply to these measurements the proposed transformations:
This would yield the following:

3) Finally, the volume of a rectangular prism is given by the product of their dimensions, so let's compare both:

Therefore by dividing the augmented volume by the original one we can tell the answer is:

Because 2³=8