A.1000x/18(1-x) B.1000x/[17x+18(1-x)] C.1000xp/18-x D.1000xp/[35+18(1-x)]
A.1000x/17x+18(1-x) B.1000x/18(1-x) C.1000x/35+18(1-x) D.1000xp/18(1-x)
A.1000c/1000p-17c B.17c/1000-17c C.1000cp/1000-17c D.1000c/1000p-35c