Ari is a metal broker who was in negotiations with three parties for the sale of a large consignment of copper he was expecting to receive on 15 March.On 1 March he wrote to the three clientsBas,Cas andDas.He wrote toBas offering to supply the copper at $6,000 per tonne for orders over 100 tonnes for delivery to be made before 1 May.Bas immediately wrote back ordering 75 tonnes for delivery on 30April.He wrote toCas offering 100 tonnes of copper at $6,500 per tonne if he placed an order before 1 May.Cas also immediately wrote back ordering 150 tonnes at the agreed price for delivery on 30April.He wrote toDas offering to supply him copper at $6,750 per tonne andDas immediately wrote back ordering 150 tonnes for delivery on 1 May.After he had sent the above letters and before he received the repliesAri discovered that he would not be able to secure the delivery of the copper.Required:AdviseAri as to his potential liability toBas,Cas andDas under the above situations, assuming that the United NationsConvention onContracts for the International Sale of Goods applies. (10 marks)