Answer:
Assuming that the final exam is worth 20% of the final grade, we can use the following formula to calculate the overall grade:
overall grade = (0.8 * current grade) + (0.2 * final exam grade)
Plugging in the values given in the problem, we get:
overall grade = (0.8 * 77%) + (0.2 * 0%) = 61.6%
Therefore, if you get a score of 0/20 on the final exam, your overall grade would be 61.6%.