Cena jednorazowa

https://www.youtube.com/watch?v=srw1s1jelV0&list=PLqWPuXFMCdRr75ghxzagrkG35k_Ke-3lh&index=21&pp=gAQBiAQB

https://scribehow.com/shared/Dodawanie_ceny_jednorazowej__sg_jN6K1S16RC9UdOWUb0w