The capacity of glass X is 80 percent of the capacity of glass Y. Further, ... ...

The capacity of glass X is 80 percent of the capacity of glass Y. Further, Glass X is 70 percent full, and glass Y is 30 percent full. Glass X contains how many more ounces of punch than glass Y?
(A) 1
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set V: Word Problems