Find the final amount after Discount

cart=['1.Girls Night wear','2.Women Night Wear','3.Girls casuals',

'4.Women Kurtis','5.Girls Party Wear','6.Women Sarees',

          '7.Boys Night Wear','8.Men Night Wear','9.Boys Everyday Wear',

          '10.Men Everyday Wear','11.Boys Party Wear','12.Men Party Wear',

          '13.Kids Uniforms']

def dress():

    print("******************")

    print("Textiles in the Shop")

    print("******************")

    for i in cart:

        print(i)

def shopping():

    a=0

    while(1):

        print("*****************")

        print("What dress do you want?")   

        c=int(input("Type serial number : "))

        if(c==1):

            a=a+420     

        elif(c==2):

            a=a+650

        elif(c==3):

            a=a+300

        elif(c==4):

            a=a+220

        elif(c==5):

           a=a+300

        elif(c==6):

            a=a+500

        elif(c==7):

            a=a+550

        elif(c==8):

            a=a+610

        elif(c==9):

            a=a+480

        elif(c==10):

            a=a+640

        elif(c==11):

            a=a+500

        elif(c==12):

            a=a+750

        elif(c==13):

            a=a+900

        else:

            print("Enter a Valid Serial Number")

        ch=input("One more Dress? Enter yes/no : ")

        if ch=='no':

            return(a) 

        

def bill(a):

    print("Your Bill amount is Rs.",a)

    if(a<250):

        print("You have no Discount!")

        print("Your Bill Amount is",a)

        d=0

    elif(a>250 and a<=500):

        d=5/100*a

    elif(a>500 and a<=1000):

        d=15/100*a

    elif(a>1000 and a<=2000):

        d=25/100*a

    else:

        d=40/100*a

    fc=a-d

    print("Your Final Cost is Rs.",fc)

dress()

amt=shopping()

bill(amt)

If you have any doubts, feel free to post it in comment Section.