Here's my code:

```
grades = [100, 100, 90, 40, 80, 100, 85, 70, 90, 65, 90, 85, 50.5]
def grades_sum(scores):
total = 0
for numbers in scores:
total += numbers
return total
print grades_sum(grades)
```

I get this error message "Oops, try again.

It looks like your grades_sum function doesn't properly compute the

sum of all the grades! It returned 7 instead of 105 for grades_sum([7,

35, 63])"

However I cannot understand why it doesn't add the values for the scores_list into the total.

Thanks if you can help!