Answer:
The answer is 20 points
Step-by-step explanation:
If the points is based on 100 by rating, and your confidence level of 'I think I know it' places you on the initial risk of 80 points as suggested, which eventually places you on the wrong side, you will be left with the following:
Total rating point of 100 minus initial risking points of 80. This leaves you with a second chance points of just 20.