>>> from taxes import taxes

>>> taxes ('Volkswagen Golf special offer 13800 €', 21)
'Volkswagen Golf special offer 16698.00€'
>>> taxes ('The price of the double room is 112.5€', 10)
'The price of the double room is 123.75€'
>>> taxes ('At the market I paid 3.2€ for a tuna can', 4)
'At the market I paid 3.33€ for a tuna can'