//member methods
public int SellLemons(Player player, Inventory inventory)
{
UserInterface.PurchaseLemonsPrompt();
int response;
while (!int.TryParse(Console.ReadLine(), out response) || player.CashOnHand < (lemonPrice * response))
{
UserInterface.InvalidLemonResponse();
}
player.CashOnHand -= (lemonPrice * response);
inventory.LemonCount += (1 * response);
int moneySpentOnLemons = lemonPrice * response;
return(moneySpentOnLemons);
}