compute_bill(code,days,start_reading,end_reading):
    if code=='B':
        return 40 + (end_reading-start_reading)*0.25
    elif code=='D':
        average= (end_reading-start_reading)/days
        if average<=100:
            return 60*days
        else:
            return 60*days+ 0.25*(average-100)*days
    elif code=='W':
        average_weekly=(end_reading-start_reading)*7/days
        if average_weekly<=900:
            return 190*(days)/7
        elif average_weekly<=1500:
            return 100*(days)/7
        else:
            return 200*days/7 + (average_weekly-1500)*0.25
    else:
        return 0


def main():
    answer=input('Do you want to continue (Y for yes N for no): ')
    if answer=='Y':
        code = input('Enter customer\'s classification code: ')
        days=int(input("Enter the number of days the vehicle was rented: "))
        start_reading=int(input('Enter vehicle\'s odometer reading at start: '))
        end_reading=int(input('Enter vehicle\'s odometer reading at the end of rental: '))
        bill=compute_bill(code,days,start_reading,end_reading)
        if code=='B':            print('Code: Budget')
        elif code=='D':          print('Code: Budget')
        elif code=='W':         print('Code: Weekly')
        print('Number of days car was rented: {}'.format(days))
        print('Starting odometer reading: {}'.format(start_reading))
        print('Ending odometer reading: {}'.format(end_reading))
        print('Total bill amount :${0:.2f}'.format(bill))
main()
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https://media.cheggcdn.com/media/28d/28d787b6-702a-4aa2-8b5e-000058025f5f/php9N7TBC.png

https://media.cheggcdn.com/media/02b/02b99b82-281d-4ecb-9107-1183eb701527/phpyU5pxs.png