The ghost method (as 81.6% chance to neither win or lose anything lol) but interesting thing is there is only 7% chance to lose 300$ and 11.4% to win 360$ , bye bye casino house edge lol.
Method in 4 steps. After each win, stop playing or go back to step 1. After losing the 4 steps, stop playing or go back to step 1.
Step 1: 10$ on a number and 10$ on same colour as number,
Step 2: 10$ on a number and 30$ on same colour as number,
Step 3: 10$ on a number and 70$ on same colour as number,
Step 4 (last one): 10$ on a number and 150$ on same colour as number.