Since average price of a pencil = 2
∴ Price of 75 pencils = 150
∴ Price of 30 pens = (510 – 150) = 360
∴ Average price of a pen = 360⁄60 = 12
30 pens and 75 pencils were purchased for 510. If the average price of a pencil was 2.00, find the average price of a pen.

1: 10
2: 11
3: 12
4: 13
5: 14