Shruti made a purchase of several number of three articles P, Q and R in the proportion 3 : 2 : 3 by paying a total amount of Rs. 4,800. If the unit costs of the articles P, Q and R are Rs. 200, Rs. 90 and Rs. 60 respectively, how many articles of Q must have been purchased by her?
1
8
2
10
3
12
4
14
5
16