calculeaza_pret_total(100, 5, reducere=0.10, taxa_livrare=0)
calculeaza_pret_total(100, 2)
calculeaza_pret_total(100, 2, taxa_livrare=0, reducere=0.10)
calculeaza_pret_total(100, taxa_livrare=0, reducere=0.10, 2)
calculeaza_pret_total(100, 3, reducere=0.10)