A fruit seller had some oranges. He sells 10% oranges and still has 360 oranges. How many oranges he had originally? Choose the correct choice from the following choices.
A) 420  B) 700  C) 220  D) 400  E) none of these

Rationale: "explanation : he sells 10 % of oranges and still there are 360 oranges remaining = > 90 % of oranges = 360 ⇒ ( 90 × total oranges ) / 100 = 360 ⇒ total oranges / 100 = 4 ⇒ total oranges = 4 × 100 = 400 answer : option d"
Answer: D