How do i add multiple values from the same variable to a txt file in python

I have this code and i cant fix it. Its a small program, just started learning. How do i add multiple values from the same variable to a txt file in python It will add the same value to the txt, if you enter two different values, it will still put the first one two times.

broj = int(input('Unesite broj puta koliko zelite da ponovite: '))

listaCena = []


if broj>0:
    for i in range(broj):
        amount = int(input('Unesite cenu: '))
        pdv_amount = int(input('Unesite pdv: '))
        pdv = (amount/100)* pdv_amount + amount

        initial = mn(amount, pdv)
        listaCena.append(initial)


for cena in listaCena:
        print("-"*50)
        print('{} {} | {} {}'.format('Ukupno: ', cena['amount'],
                                    'Sa PDV-om: ', cena['pdv']))


text_file = open("cene.txt", "a")
for i in range(broj):
    text_file.write('{} {} | {} {}'.format('Ukupno: ', cena['amount'],
                                        'Sa PDV-om: ', cena['pdv'])+'\n')
text_file.close()