A company exports 200 pieces of goods, each with a gross weight of 95kg and a volume of 100cm X 40cm X 25cm. Freight rates of the Chamfun Company, which is rated W/M, rated 8 and priced at $80 per ton. 10% for port surcharge and 15% for direct shipping. We quoted FOB Shanghai for US$400 each, and our customers asked for CIFC2% London price. Assuming the insurance premium rate is 0.6% and the insurance premium plus 10%, what should we quote under the condition that the foreign exchange income remains unchanged? (requires written calculation formula and calculation process)