2-We must calculate the banana price by supplying both how many KGs of bananas we are adding to the cart, and the price per KG in the constructor. The getCost() method will return the total cost based on these two values.
3- Lemon: This class also inherits from Fruit. You must supply a price per lemon and how many lemons we are adding through the constructor. The getCost() method will just return the cost of all the lemons.
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