If 10 litres of an oil of Rs.40 per litres be mixed with 5 litres of another oil of Rs.66 per litre then what is the rate of mixed oil per litre?  Select.
A) Rs.48.66	B) Rs.51.03	C) Rs.54.17	D) Rs.55.33	E) None of the above
40*10= 
<gadget id="calculator">40*10</gadget>
<output>400</output>
400   66*5= 
<gadget id="calculator">66*5</gadget>
<output>330</output>
330   730/15= 48.66   Rs.48.66NSWER:Rs.48.66
<result>A</result>
If 10 litres of an oil of Rs.40 per litres be mixed with 5 litres of another oil of Rs.66 per litre then what is the rate of mixed oil per litre?