30 pens and 75 pencils were purchased for 450. If the average price of a pencil was 2.00, find the average price of a pen. Pick one:
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 = ( 450 – 150 ) = 300 ∴ average price of a pen = 360 ⁄ 60 = 10 answer a
Answer: A