Since average price of a pencil = 2
∴ Price of 75 pencils = 150
∴ Price of 30 pens = (630 – 150) = 480
∴ Average price of a pen = 480⁄60 = 16
30 pens and 75 pencils were purchased for 630. If the average price of a pencil was 2.00, find the average price of a pen.

a. 10
b. 11
c. 12
d. 13
e. 16