Answer:
I wouldn't invest.
Risk preference at least 50-50 chance of gain and loose
Explanation:
case of success the return i get is $40000
case of failure i lose $20000.
My analysis shows P40=0.3 of success
And P-20=0.7 of failure.
The probability of a loose is much bigger than the probability of a gain.
So I can't bear the loose of loosing 7 times if about 20000 and gaining 3 times of about 40000 it doesn't balance.
My loose accumulating to 140000
While my gain is 120000.
I can't invest