问道数学题！！

篱笆下的青锋剑

GWD上的：

Q28:

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 B, 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)

篱笆下的青锋剑

还请指教如何计算啊！我算出来结果特麻烦……

jeena

不会，COST一样吗？卖了多少？只知道售价就能求REVENUE吗？

ijoy

没个对的

烈火青春

莫非要用极限法。。。。==