>>> from increase import increase

>>> increase ('Tomatoes, price per kg.: 3.65  €', 10)
'Tomatoes, price per kg.: 4.02€'
>>> increase ('Mango, price per unit: 1.5€ (sale)', 5)
'Mango, price per unit: 1.58€ (sale)'
>>> increase ('White wine, price per litre: 1.2€ (only today)', 7)
'White wine, price per litre: 1.28€ (only today)'