A grocer purchased 80 kg of sugar at Rs. 13.50 per kg and mixed it with 120 kg of sugar of cost Rs. 16 per kg. At what rate should he sell the mixture (per kg) to gain 16%?

• A.  Rs. 15.30 
• B.  Rs. 19.18       
• C.  Rs. 17.40       
• D.      Rs. 18.66