If the price of a certain computer increased 30 percent from b dollars to 351 dollars, then 2b =	Choose one
A) 540 B) 570 C) 619 D) 649 E) 700

Rationale: "before price increase price = b after 30 % price increase price = b + ( 30 / 100 ) * b = 1.3 b = 351 ( given ) i . e . b = 351 / 1.3 = $ 270 i . e . 2 b = 2 * 270 = 540 answer : option a"
Answer: A