A trader sells 80 meters of cloth for Rs. 6900 at the profit of Rs. 20 per metre of cloth. What is the cost price of one metre of cloth?
Choose the correct choice from the following answers:  A) 22  B) 75  C) 90  D) 78  E) 66

Rationale: "sp of 1 m of cloth = 6900 / 80 = rs . 86 cp of 1 m of cloth = sp of 1 m of cloth - profit on 1 m of cloth = rs . 86 - rs . 20 = rs . 66 . answer : e"
Answer: E