Trading commissions - valid output

# Trade Commissions

city = input()
sales = float(input())

commission = 0

if city == 'London':
    if 0 <= sales <= 500:
        commission = 5
    elif 500 < sales <= 1000:
        commission = 7
    elif 1000 < sales <= 10000:
        commission = 8
    else:
        commission = 12

elif city == 'New York':
    if 0 <= sales <= 500:
        commission = 4.5
    elif 500 < sales <= 1000:
        commission = 7.5
    elif 1000 < sales <= 10000:
        commission = 10
    else:
        commission = 13

elif city == 'Sidney':
    if 0 <= sales <= 500:
        commission = 5.5
    elif 500 < sales <= 1000:
        commission = 8
    elif 1000 < sales <= 10000:
        commission = 12
    else:
        commission = 14.5

commission_amount = commission / 100
earnings = sales * commission_amount

if sales >= 0:
    if city in ['London', 'New York', 'Sidney']:
        print(f'{earnings:.2f}')
    else:
        print('error')
else:
    print('error')