30 pens and 75 pencils were purchased for 570. If the average price of a pencil was 2.00, find the average price of a pen.  Pick.
A) 10  B) 11  C) 12  D) 13  E) 14

Rationale: "since average price of a pencil = 2 ∴ price of 75 pencils = 150 ∴ price of 30 pens = ( 570 – 150 ) = 360 ∴ average price of a pen = 420 ⁄ 60 = 14 answer e"
Answer: E