Total amount of bills

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Python

Hi i need a little help, why does when i try to print "total" it says that "total is not defined"

def total(self):
        sum=0
        for elem in self:
            sum=sum+elem
        return sum

must calculate the total sum of the list values

class BillBatch:
    def __init__(self,list_of_bills):
        self.list_of_bills=list_of_bills

    def __len__(self):
        return len(self.list_of_bills)
    
    def total(self):
        sum=0
        for elem in self:
            sum=sum+elem
        return sum
        

    def __getitem__(self,index):
        return self.list_of_bills[index]



values = [10, 20, 50, 100] 
   
print("The number of Bills in the batch: ", len(values)) 

print(total(values))

What I have tried:

i tried the code cleanly with no class and it works, i'm definitely not doing something right.