A is a retail company selling budget laptops. Customers have the right to return the product within $30$ days if they are unsatisfied. They will receive a full refund when the product is returned in its original state. A sold $10$ laptops at $500$ each. The cost of each product is $200.$ Based on its experience, A expects that $5\%$ of the products sold will be returned. The refund liability that should be recognised in A$$s balance sheet at the end of the year is: