If 10 litres of an oil of Rs.50 per litres be mixed with 5 litres of another oil of Rs.67 per litre then what is the rate of mixed oil per litre?
Options: A) Rs.49.17 B) Rs.51.03 C) Rs.54.17 D) Rs.55.66 E) None of the above
50*10= 
<gadget id="calculator">50*10</gadget>
<output>500</output>
500   67*5= 
<gadget id="calculator">67*5</gadget>
<output>335</output>
335   835/15= 55.66   ANSWER:Rs.55.66
<result>D</result>
If 10 litres of an oil of Rs.50 per litres be mixed with 5 litres of another oil of Rs.67 per litre then what is the rate of mixed oil per litre?