300k method - 10 to 15 minutes
requirements
Gang Rat
Have every Cartel capped
m900(cheapest helicopter be sure to make with Panagia)
Step 1. Fly to each cartel scroll on fridge - Take out money
Step 2. Fly to Southeast rebel (cause your a pussy)
Step 3. Sell money and deposit all in account then (if someone questions you just say you put half in gang account)
Step 4. Make more m900s with rubber