Contribute correction: Betalen met munten en biljetten

  ____      _____    _    _      ___    
 |  _ \\   |  ___|| | \  / ||   / _ \\  
 | |_| ||  | ||__   |  \/  ||  | / \ || 
 | .  //   | ||__   | .  . ||  | \_/ || 
 |_|\_\\   |_____|| |_|\/|_||   \___//  
 `-` --`   `-----`  `-`  `-`    `---`