If 10 litres of an oil of Rs.55 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 choice from the following answers:
A) rs . 49.17 B) rs . 51.03 C) rs . 58.66 D) rs . 55.33 E) none of the above

Rationale: 55 * 10 = 550 66 * 5 = 330 880 / 15 = 58.66 answer : c
Answer: C