Solve the ideal diode circuit

1. assume forward biased
2. replace the diode with iD going down and short circuit it and make VD=0
3. combine 70Ω and 30Ω resistors that are parallel and it becomes 21Ω
4. now 21Ω resistance is in parallel with 3V and the (40Ω resistors and 50mA)
5. ID=50mA meaning the assumption was correct

This is how i attempted the problem and i'm missing something because the final answer i get is odd.Any help or pointer would be greatly appreciated, Thankyou.update:

update: