If 10 litres of an oil of Rs.54 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?	Choose the correct option:
A) Rs.49.17 B) Rs.58 C) Rs.54.17 D) Rs.55.33 E) None of the above
54*10= 
<gadget id="calculator">54*10</gadget>
<output>540</output>
540   66*5= 
<gadget id="calculator">66*5</gadget>
<output>330</output>
330   870/15= 
<gadget id="calculator">870/15</gadget>
<output>58</output>
58   ANSWER:Rs.58
<result>B</result>
If 10 litres of an oil of Rs.54 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?