€10 spent = 100g free
€20 spent = 150g free 
€30 spent = 200g free
€40 spent = 250g free 
€50 spent = 300g free 
€60 spent = 350g free 
€70 spent = 400g free 
€80 spent = 450g free 
€90 spent = 500g free 
€100 spent = 550g free