A person bought 20 kg of rice at Rs 10.50 per kg and 30 kgs at Rs 12 per kg. He mixed the two and sold the mixture at Rs 11.40 per kg. What was the gain in his deal(in Rs)?	Choose the correct choice
A) 0  B) 20  C) 75  D) 5  E) 10
Explanation :   Gain = 50 * 11.40 - (20*10.5 + 30*12)= 
<gadget id="calculator">50 * 11.40 - (20*10.5 + 30*12)</gadget>
<output>0</output>
0   0nswer : 0
<result>A</result>
A person bought 20 kg of rice at Rs 10.50 per kg and 30 kgs at Rs 12 per kg. He mixed the two and sold the mixture at Rs 11.40 per kg. What was the gain in his deal(in Rs)?