Answer:
Replace ''' Your solution goes here '''
With
for i in test_grades:
if i > 100:
sum_extra+=i - 100
Step-by-step explanation:
This iterates through the list
for i in test_grades:
This checks for list elements greater than 100
if i > 100:
The extra digits (above 100) are then added together
sum_extra+=i - 100