public int SellCups(Player player, Inventory inventory)
{
UserInterface.PurchaseCupsPrompt();
int response;
while (!int.TryParse(Console.ReadLine(), out response) || player.CashOnHand < (cupPrice * response))
{
UserInterface.InvalidCupsResponse();
}
player.CashOnHand -= (cupPrice * response);
inventory.CupCount += (1 * response);
int moneySpentOnCups = cupPrice * response;
return(moneySpentOnCups);
}