mail a package

To mail a package, the rate is x cents for the first
pound and y cents for each additional pound, where
x > y. Two packages weighing 3 pounds and 5 pounds,
respectively, can be mailed separately or combined as
one package. Which method is cheaper, and how
much money is saved?

(A) Combined, with a savings of x – y cents
(B) Combined, with a savings of y – x cents
(C) Combined, with a savings of x cents
(D) Separately, with a savings of x – y cents
(E) Separately, with a savings of y cents