Ummmm I think so if not I'm sorry
I don't know the correct answer from part b and I can't sing very well, so I'll skip that part.
The volume is length times width times height.

I used a computer calculator.
Answer: 77.616 cubic centimeters
5 pounds of sugar÷3 containers=1.75 of sugar and 1.75 of sugar was used to make the pie
39 depending on the prices but 39 is how many he sold