Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store's revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p?
A. 100p/ (125 - p)
B. 150p/ (250 - p)
C. 300p/ (375 - p)
D. 400p/ (500 - p)
E. 500p/ (625 - p)