Subject: mathqa
Question: if â € œ * â €  is called â € œ + â €  , â € œ / â €  is called â € œ * â €  , â € œ - â €  is called â € œ / â €  , â € œ + â €  is called â € œ - â €  . 240 * 80 / 60 + 40 / 10 = ?
Option: 
A: - 2407
B: 2509
C: none of these
D: - 2305
Answer: A