Answer:
The minimum fraction is 80%
Step-by-step explanation:
Creditors receive 80 million in bankruptcy since if there is bankruptcy, the bankruptcy cost is $20m while the other $80m is received by creditors, so they need to receive at least this much. Therefore, the minimum fraction of the firm's equity that management would need to offer to creditors for the workout to be successful is 80%. Tefco could offer its creditors 80% of the firm in a workout.