Thread: Calculate threshold value

Hi i have a question about threashold value.

Asset - $2000
Threat 1 - 0.30 and reduce asset value by half
Threat 2 - 0.55 destroy everything
Threat 3 - Both occur

Calculate max threshold
my working:
Threat 1 or threat 2 or (threat 1 and threat 2)

Any mistake for mine probability ?