I input the following:

```
shopping_list = ["banana", "orange", "apple"]
stock = {
"banana": 6,
"apple": 0,
"orange": 32,
"pear": 15
}
prices = {
"banana": 4,
"apple": 2,
"orange": 1.5,
"pear": 3
}
# Write your code below!
def compute_bill(shopping_list):
total = 0
for item in shopping_list:
total += prices["banana"]
total += prices["orange"]
total += prices["apple"]
return total
```

But, I get this error:

```
Oops, try again.
compute_bill(['apple']) returned 7.5 instead of 2
```

Can somebody please explain to me what I'm doing wrong? I've been stuck on this exercise for over an hour now.