Ramees bought 4 dozen apples at Rs. 12 per dozen and 2 dozen apples at Rs. 16 per dozen. He sold all of them to earn 20%. At what price per dozen did he sell the apples?

A. Rs. 14.40
B. Rs. 16.00
C. Rs. 16.80
D. Rs. 19.20
Explanation:
6 dozen apples = Rs. (12 × 4 + 16 × 2) = Rs. 80
Gain = 20%
S.P = Rs. (120/100 × 80) = Rs. 96
Per dozen = Rs. (96/6) = Rs. 16