If 70 percent of 600 is 40 percent of x, then x=?  Choices.
A) 105	B) 168	C) 342	D) 660	E) 1050

Rationale: "given : 0.7 * 600 = 0.4 x - - > 420 = 4 / 10 * x - - > x = 1,050 . answer : e ."
Answer: E